Which is related to the number of electrons in the outer main energy level of the elements from the alkali metals to the halogens?

I. Group Number
II. Period Number

A. I only
B. II only
C. Both I and II
D. Neither I nor II

Question

Which is related to the number of electrons in the outer main energy level of the elements from the alkali metals to the halogens? 

I. Group Number
II. Period Number

A.  I only
B.  II only 
C.  Both I and II
D.  Neither I nor II

rushwr · Answer

I would say group number

rushwr · Answer

It's just the no. of electrons. SO it is only group number

jebonna · Answer

I agree with Rushwr :)

sweetburger · Answer

Group number i believe is correct.