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Atom number 20 is Calcium (period IV, group 2)

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Is lead made up of only one atom?

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An element's square in the periodic table typically includes its atomic number, which indicates the number of protons in its nucleus, the element symbol (a one- or two-letter abbreviation of its name), and the atomic mass, which is the weighted average mass of the element's isotopes. Some periodic tables may also include additional information such as the element's state at room temperature (solid, liquid, gas) and its electron configuration.


What is a chart that lists all the known elements?

It is called the Periodic Table of Elements.


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