Question

fill in the blank: elements in the same ____ on the periodic table have the same number of valence electrons. properties of elements within a _____ on a periodic table change in a predictable way from one side of the table to the other. the number of ____ in an atom determines the identity of an element.

Answer 1

4)group

5)period

6)protons

Answer 2

4)group
5)period
6)protons