A compound contains a ion if its name ends with “-ite” or “-at

polyatomic

maybe.

Explanation:

When a polyatomic ion that includes oxygen is in the formula, the compound name generally ends in -ite or -ate

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.