An atom in an excited state can have an electron configuration of
A. 1s2 2s2
*B. 1s2 2p1
C. 1s2 2p2
D. 1s2 2s2 2p5
E. 1s2 2s2 2p6
Compared to the charge and mass of a proton an electron has
A. The same charge and smaller mass
B. The same charge and the same mass
*C. The opposite charge and smaller mass
D. The opposite charge and the same mass
What is the total number of sublevels in the fourth principal energy level?
A. 1
B. 2
C. 3
*D. 4
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