Question

In the periodic table, the period number indicates

A. the number of valence electrons for elements in that period.
B. the number of dots shown on the Lewis dot diagrams for elements in that period.
C. the reactivity levels for elements in that period
D. the number of the outermost energy level for elements in that period ​

Answer 1

I think the answer is D because periods represent the number of atomic orbitals in an atom.