Question

How many unpaired electrons are in a:
a.zinc atom 0 correct: your answer is correct.
b.nitrogen atom 3 correct: your answer is correct.
c.chlorine atom 1 correct: your answer is correct.
d.nickel atom 0 incorrect: your answer is incorrect. submit answer?

Answer 1

₃₀Zn 1s²2s²2p⁶3s²3p⁶3d¹°4s², both electron in 4s orbital is paired. so 0 unpaired.
₇N 1s²2s²2p³, in 2pₓ,2py and 2pz are 1 unpaired electron, so sum is 3.
₁₇Cl 1s²2s²2p⁶3s²3p⁵, 4 are paired, 1 unpaired in 3p orbital.
₂₈Ni 1s²2s²2p⁶3s²3p⁶3d⁸4s², has 2 unpaired electrons in 3d orbital.