How many inner shell (core) electrons do the following elements have, respectively?
Hydrogen, Helium, Lithium and Berylium
(A) 1, 1, 1, 1
(B) 0, 0, 1, 1
(C) 0, 0, 2, 1
(D) 0, 0, 2, 2
(E) 2, 2, 2, 2
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