Periodic table of elements
Legend
This version of the periodic table features some essential elements and a few properties:
- the chemical symbol, consisting of at most two letters, the first always capitalized
- the atomic number, or the number of protons in the atom above the chemical symbol
- the period (1 -- 7), or row, tells the number of electron shells in the atom
- the group (I -- VIII), or column, tells the number of electrons on the outermost shell in the atom
- metals are framed in blue
- metalloids are framed in light blue
- nonmetals are framed in orange