According to these electron configuration, which element in group 15 would have the largest atomic radius?

a. [ne] 3s^2 3p^3
b. [he] 2s^2 2p^3
c. [ar] 4s^2 3d^10 4p^3
d. [kr] 5s^2 4d^10 5p^3
e. [xe] 6s^2 4f^14 5d^10 6p^3

E.

Explanation:

The atomic radii increase in size down the group  as the number of quantum  shells and subshells  increase with increasing atomic number.

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.

hey there!

mass = 6.75 g

volume =   9 cm³

therefore:

d = mass / volume

d   = 6.75 / 9

d = 0.7 g/cm³

answer b