What do all elements in a column in the periodic table have in common? (2 points) Oa
Their atoms have the same number of valence electrons.
Ob
Their atoms have the same atomic mass.
Their atoms have the same number of protons and electrons.
Od
Their atoms have the same number of neutrons.

You mean in periods.

They have the same number of elctron shells.

But if they are in the same group then they have the sane number oifValence electrons.

Explanation:

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2