Question

1. Each period in the periodic table corresponds to _____. (1 point)
A.a principal energy level
B.an energy sublevel
C.an orbital
D.a suborbital

Answer 1

wtf?

Answer 2

A : a principal energy level.
Think about it, since the periods are the horizontal rows, each time you go down one, you are adding one to the principal energy level. H and He both have only the first energy level, then Li, Be etc. have the first and the second.

Answer 3

1. A (principal energy level)
2. D (Dmitri Mendeleev)
3. C (metals)