Question 1

how many elements are on the periodic table

Accepted Answer

Currently, there are 118 officially recognized elements on the periodic table. Some have been synthesized in labs and are not found naturally, while others are primordial or result from radioactive decay of primordial elements.

Question 2

how many elements on periodic table

Accepted Answer

There are currently 118 officially recognized elements on the periodic table.

Question 3

what is period table

Accepted Answer

The periodic table (often called the periodic table of elements) is a tabular arrangement of the chemical elements. These elements are organized by their atomic number, electron configuration, and recurring chemical properties. It's a fundamental tool in chemistry for understanding element relationships and predicting properties.

Question 4

how many elements on a periodic table

Accepted Answer

A standard periodic table displays 118 officially recognized chemical elements.

Question 5

how is the periodic table organized

Accepted Answer

The periodic table is organized by increasing atomic number (the number of protons in an atom's nucleus). Elements are arranged in horizontal rows called periods and vertical columns called groups. Elements in the same group share similar chemical properties due to having similar valence electron configurations. The layout also reflects trends in properties like electronegativity and atomic radius.

Question 6

how many elements in the periodic table

Accepted Answer

The periodic table contains 118 recognized elements.

Question 7

how many elements on the periodic table

Accepted Answer

There are 118 officially recognized elements on the periodic table.

Question 8

what is at in the periodic table

Accepted Answer

"At" is the chemical symbol for Astatine. It is a radioactive element with atomic number 85 and is the rarest naturally occurring element in the Earth's crust. It belongs to the halogen group (Group 17).

Question 9

what is a periodic table of the elements

Accepted Answer

A periodic table of the elements is a chart that organizes all known chemical elements in order of increasing atomic number. This arrangement shows periodic trends in the elements' properties, grouping elements with similar characteristics together in columns (groups) and rows (periods).

Question 10

what is the periodic table

Accepted Answer

The periodic table is a systematic arrangement of chemical elements based on their atomic number, electron configuration, and recurring chemical properties. It provides a framework for classifying elements and understanding their behavior.

Question 11

how many elements are in the periodic table

Accepted Answer

There are 118 recognized elements in the periodic table.

Question 12

what is a period on the periodic table

Accepted Answer

A period on the periodic table is a horizontal row. Elements in the same period have the same number of electron shells (energy levels). As you move across a period from left to right, the atomic number increases, and properties generally change in a predictable way.

Question 13

who created the periodic table

Accepted Answer

The Russian chemist Dmitri Mendeleev is most widely credited with creating the first recognizable periodic table in 1869. He arranged elements by atomic mass and was able to predict the properties of elements yet to be discovered. Lothar Meyer, a German chemist, independently developed a similar table around the same time.

Question 14

why was the periodic table invented

Accepted Answer

The periodic table was invented to organize the growing number of known chemical elements in a logical way. Its creators aimed to:
- Show relationships between elements based on their properties.
- Predict the properties of undiscovered elements.
- Provide a systematic framework for studying chemistry.

Question 15

does the acs final provide the periodic table

Accepted Answer

Generally, standardized chemistry exams like those administered by the American Chemical Society (ACS) do provide a periodic table for examinees. However, it's always best to confirm the specific materials allowed for your particular exam with your instructor or the testing institution, as policies can vary.

Question 16

how many groups are in the periodic table

Accepted Answer

There are 18 groups in the modern periodic table. These are the vertical columns, numbered 1 through 18 from left to right.

Question 17

how to read a periodic table

Accepted Answer

To read a periodic table:
- Each box represents an element.
- Look for the atomic number (usually at the top of the box), which is the number of protons.
- The large letter(s) is the element symbol (e.g., H for Hydrogen, He for Helium).
- The element name is usually written below the symbol.
- The atomic mass (or atomic weight) is typically found at the bottom, representing the average mass of an atom.
- Elements are arranged in rows (periods) and columns (groups). Group numbers (1-18) and period numbers (1-7) help locate elements and understand trends.

Question 18

how to read periodic table

Accepted Answer

To read the periodic table, understand that each square contains information about one element: its symbol, atomic number (number of protons), and atomic mass. Elements are arranged by increasing atomic number into rows (periods) and columns (groups), where groups share similar chemical properties.

Question 19

where are metals located on the periodic table

Accepted Answer

Metals are predominantly located on the left side and in the center of the periodic table. This includes:
- Alkali metals (Group 1, except Hydrogen)
- Alkaline earth metals (Group 2)
- Transition metals (Groups 3-12)
- Lanthanides and Actinides (the two rows usually shown at the bottom)
- Other metals like Aluminum (Al), Gallium (Ga), Tin (Sn), Lead (Pb), Bismuth (Bi), etc., found in Groups 13-16.
A "staircase" line generally separates metals from nonmetals, with metals to the left of this line.

Question 20

where is tp on the periodic table

Accepted Answer

"Tp" is not a recognized official symbol for any chemical element on the periodic table. Element symbols are typically one or two letters, derived from the element's name (often its Latin or Greek name), with the first letter capitalized and the second, if present, lowercase.

Question 21

who invented the periodic table

Accepted Answer

Dmitri Mendeleev, a Russian chemist, is primarily credited with inventing the periodic table in 1869. He organized elements by atomic mass and chemical properties, famously leaving gaps for elements that had not yet been discovered.

Question 22

how many elements in periodic table

Accepted Answer

The periodic table features 118 officially recognized elements.

Question 23

how many periodic table of elements

Accepted Answer

This question likely refers to the number of elements in the periodic table. There are 118 officially recognized elements in the periodic table of elements.

Question 24

how many periods are in the periodic table

Accepted Answer

There are 7 periods in the periodic table. These are the horizontal rows, each corresponding to the filling of a new principal electron shell.

Question 25

what is in the periodic table

Accepted Answer

The periodic table contains all the known chemical elements. Each element is a unique type of atom, distinguished by its atomic number (the number of protons in its nucleus). The table displays information for each element, such as its symbol, atomic number, and atomic mass, and organizes them to show trends in their properties.

Question 26

where are nonmetals located on the periodic table

Accepted Answer

Nonmetals are primarily located on the upper right side of the periodic table, generally to the right of the "staircase" line that divides metals from nonmetals. Hydrogen, though in Group 1, is also a nonmetal. This category includes elements like Carbon (C), Nitrogen (N), Oxygen (O), Phosphorus (P), Sulfur (S), Selenium (Se), the halogens (Group 17), and the noble gases (Group 18).

Question 27

how is the periodic table of elements organized

Accepted Answer

The periodic table of elements is organized by increasing atomic number. Elements are arranged into:
- Periods: Horizontal rows, where elements have the same number of electron shells.
- Groups: Vertical columns, where elements typically share similar chemical properties and valence electron configurations.
This organization highlights periodic trends in element properties.

Question 28

how many elements in the periodic table of elements

Accepted Answer

There are 118 officially recognized elements in the periodic table of elements.

Question 29

how many periodic table elements

Accepted Answer

There are 118 recognized periodic table elements.

Question 30

how to read a periodic table element

Accepted Answer

When reading a periodic table element (the information in one box):
- Atomic Number: Usually at the top, this integer is the number of protons in the atom's nucleus (and electrons in a neutral atom).
- Element Symbol: A one or two-letter abbreviation for the element (e.g., 'H' for Hydrogen, 'Fe' for Iron).
- Element Name: The full name of the element (e.g., Hydrogen, Iron).
- Atomic Mass (or Atomic Weight): Usually at the bottom, this is the average mass of an atom of the element, typically in atomic mass units (amu).
The element's position (period and group) also gives crucial information about its properties.

Question 31

what are periods on the periodic table

Accepted Answer

Periods on the periodic table are the horizontal rows. There are 7 periods. Elements within the same period have the same number of principal electron shells. As you move from left to right across a period, the atomic number increases by one for each element, and there is a general trend in changing properties.

Question 32

what are the elements on the periodic table

Accepted Answer

The elements on the periodic table are the fundamental chemical substances, each consisting of atoms with a specific number of protons in their nucleus (the atomic number). These include well-known substances like Hydrogen (H), Oxygen (O), Carbon (C), Iron (Fe), Gold (Au), and all other discovered or synthesized elements up to 118.

Question 33

what is a group on the periodic table

Accepted Answer

A group (also known as a family) on the periodic table is a vertical column. Elements within the same group typically have similar chemical properties because they have the same number of valence electrons (electrons in the outermost shell). There are 18 groups in the modern periodic table.

Question 34

what is na on the periodic table

Accepted Answer

"Na" is the chemical symbol for Sodium. Sodium is an alkali metal (Group 1) with atomic number 11. Its symbol comes from its Latin name, 'natrium'.

Question 35

what is the periodic table of elements

Accepted Answer

The periodic table of elements is a chart that systematically organizes all known chemical elements according to their atomic number, electron configurations, and recurring chemical properties. It is a cornerstone of chemistry, providing a visual representation of the periodic law.

Question 36

where are metalloids located on the periodic table

Accepted Answer

Metalloids (or semimetals) are located along the diagonal "staircase" line that separates metals from nonmetals on the periodic table. Common metalloids include:
- Boron (B)
- Silicon (Si)
- Germanium (Ge)
- Arsenic (As)
- Antimony (Sb)
- Tellurium (Te)
Polonium (Po) and Astatine (At) are sometimes also considered metalloids, though their classification can vary. Metalloids exhibit properties intermediate between metals and nonmetals.

Question 37

how are elements arranged on the periodic table

Accepted Answer

Elements are arranged on the periodic table primarily in order of increasing atomic number. They are organized into:
- Periods (rows): Elements in the same period have the same number of electron shells.
- Groups (columns): Elements in the same group have similar valence electron configurations and thus similar chemical properties.
This arrangement reflects the periodic law, which states that the properties of elements are periodic functions of their atomic numbers.

Question 38

how is the periodic table arranged

Accepted Answer

The periodic table is arranged by increasing atomic number. Elements are placed in rows (periods) and columns (groups) to illustrate recurring ("periodic") trends in their properties. Elements in the same column (group) share similar chemical behaviors.

Question 39

how many elements of the periodic table

Accepted Answer

There are 118 known elements of the periodic table that have been officially recognized by the International Union of Pure and Applied Chemistry (IUPAC).

Question 40

how many groups are on the periodic table

Accepted Answer

There are 18 groups (vertical columns) on the periodic table, numbered 1 to 18.

Question 41

how many periods in the periodic table

Accepted Answer

The periodic table has 7 periods (horizontal rows).

Question 42

how many periods on the periodic table

Accepted Answer

There are 7 periods on the periodic table.

Question 43

how to find valence electrons on periodic table

Accepted Answer

For main group elements (Groups 1, 2, and 13-18), the number of valence electrons (electrons in the outermost shell) can often be determined by the group number:
- Group 1 (IA): 1 valence electron
- Group 2 (IIA): 2 valence electrons
- Group 13 (IIIA): 3 valence electrons
- Group 14 (IVA): 4 valence electrons
- Group 15 (VA): 5 valence electrons
- Group 16 (VIA): 6 valence electrons
- Group 17 (VIIA): 7 valence electrons
- Group 18 (VIIIA): 8 valence electrons (except Helium, which has 2)
For transition metals (Groups 3-12) and inner transition metals, determining valence electrons is more complex and depends on the specific electron configuration.

Question 44

how to read the periodic table

Accepted Answer

To read the periodic table effectively, focus on:
- Element Boxes: Each contains the atomic number, symbol, name, and atomic mass.
- Atomic Number: Indicates protons (and electrons in a neutral atom). Elements are ordered by this.
- Periods (Rows): Indicate the principal energy level of valence electrons.
- Groups (Columns): Elements in a group share similar chemical properties.
- Trends: Understand how properties like atomic radius, electronegativity, and ionization energy change across periods and down groups.

Question 45

how to read the periodic table of elements

Accepted Answer

Reading the periodic table of elements involves understanding its structure. Each element has a box with its atomic number (protons), symbol, name, and atomic mass. Elements are arranged by atomic number into periods (rows) and groups (columns). Groups contain elements with similar chemical behaviors due to similar outer electron configurations.

Question 46

what is be on the periodic table of elements

Accepted Answer

"Be" is the chemical symbol for Beryllium. It is an alkaline earth metal found in Group 2 of the periodic table, with atomic number 4.

Question 47

what is be periodic table

Accepted Answer

"Be" on the periodic table stands for Beryllium. It is chemical element with atomic number 4 and is classified as an alkaline earth metal (Group 2).

Question 48

what is period in the periodic table

Accepted Answer

A period in the periodic table is a horizontal row. Elements in the same period have the same number of electron shells. There are 7 periods, and properties change systematically across a period.

Question 49

where are the metals located on the periodic table

Accepted Answer

Metals are located primarily on the left side and in the central block of the periodic table. They are separated from nonmetals by a diagonal line often called the "staircase." This vast category includes alkali metals, alkaline earth metals, transition metals, lanthanides, actinides, and other post-transition metals.

Question 50

who invented the periodic table elements

Accepted Answer

While many scientists contributed to the understanding of elements, Dmitri Mendeleev is credited with inventing the periodic table (the system of organizing the elements) in 1869. Individual elements were discovered by various scientists over centuries.

Question 51

who invented the periodic table of the elements

Accepted Answer

Dmitri Mendeleev is the chemist most famously credited with inventing the periodic table of the elements in 1869. His table organized elements by atomic mass and predicted future discoveries.

Question 52

who made the periodic table

Accepted Answer

The most significant contribution to making the periodic table as we recognize it today came from Russian chemist Dmitri Mendeleev in 1869. Lothar Meyer also independently developed a similar system.

Question 53

a element periodic table

Accepted Answer

An element on the periodic table is a pure substance consisting only of atoms that all have the same numbers of protons in their atomic nuclei. The periodic table lists all known elements, such as hydrogen, carbon, oxygen, iron, etc., and organizes them by their atomic number and properties.

Question 54

how do you read a periodic table of elements

Accepted Answer

To read a periodic table of elements, you look at how it's structured:
- Each element is in a box with its atomic number (protons), symbol, name, and atomic mass.
- Elements are arranged in order of increasing atomic number.
- Rows are called periods. Elements in a period have the same number of electron shells.
- Columns are called groups. Elements in a group have similar chemical properties.

Question 55

how many a groups are in the periodic table

Accepted Answer

In an older system for numbering groups on the periodic table, the main group elements (modern IUPAC Groups 1, 2, and 13-18) were designated as "A" groups (e.g., IA, IIA, IIIA through VIIIA or 1A, 2A, 3A through 8A). There are 8 such "A" groups in this system. The modern IUPAC system numbers all groups from 1 to 18 consecutively.

Question 56

how many elements in a periodic table

Accepted Answer

A periodic table lists 118 officially recognized chemical elements.

Question 57

how to read periodic table of elements

Accepted Answer

To read the periodic table of elements, identify the key information for each element (atomic number, symbol, name, atomic mass) and understand its arrangement in periods (rows showing electron shell filling) and groups (columns showing similar chemical properties).

Question 58

how to read the periodic table of the elements

Accepted Answer

Reading the periodic table of the elements involves understanding its grid structure. Each square gives the element's atomic number, symbol, name, and atomic mass. The elements are listed by increasing atomic number in rows (periods) and columns (groups), which group elements with similar characteristics.

Question 59

what are the groups on the periodic table

Accepted Answer

The groups on the periodic table are the vertical columns. There are 18 groups, numbered 1-18. Elements within the same group generally share similar chemical properties because they have the same number of valence electrons (electrons in their outermost shell).

Question 60

what is a group on periodic table

Accepted Answer

A group on the periodic table is a vertical column of elements. Elements in the same group tend to have similar chemical behaviors due to having the same number of valence electrons.

Question 61

what is a period in the periodic table

Accepted Answer

A period in the periodic table is one of the horizontal rows. Elements in the same period have the same number of electron shells. There are 7 periods.

Question 62

what is a periodic table

Accepted Answer

A periodic table is a chart that arranges chemical elements by their atomic number, electron configuration, and recurring chemical properties. It helps to visualize relationships and trends among elements.

Question 63

what is at on the periodic table

Accepted Answer

"At" on the periodic table is the symbol for Astatine, atomic number 85. It's a highly radioactive halogen.

Question 64

what is fe on the periodic table

Accepted Answer

"Fe" on the periodic table is the chemical symbol for Iron. Iron is a transition metal (Group 8) with atomic number 26. Its symbol comes from its Latin name, 'ferrum'.

Periodic Table FAQs

Periodic Table FAQs