Question

As you move across a period, elements have the same number of _______ as those next to them.

Answer 1

electron shells

Step-by-step explanation:

Answer 2

The same numbers of shell

Step-by-step explanation:

Elements in the same periods have the same numbers of shells of electrons. This implies that across the period, electrons are filled into the same shells until it filled. So, As you move across the period, elements have the same number of shells