The element with the ground state electron configuration of 1s2 2s2 2p6 3s2 is
A. Mg.
B. Ca.
C. Mn.
D. Ne.
Answer:A
The element with the ground state electron configuration of 1s2 2s2 2p6 3s2 is
A. Mg. B. Ca. C. Mn. D. Ne.