What does an atom's period tell us?

A horizontal row in the periodic table, which signifies the totoal number of electron shells in an element's atom.

Explanation:

Hope this helpss)):

passed in september 1935, these laws are known as nuremberg laws.   they forbid jews from marrying but not directly forced them to divorce aryans. what is most noticeable is the fact that the jews were defranchised, meaning by this that they were not expected to have any civil rights, including the right to vote. the right answer is deprived of the right to vote.

indium, and thallium have three electrons i think