How many inner, outer, and valence electrons are present in an atom of each of the following elements?
(a) o inner: 2 outer: 6 valence: 5
(b) sn inner: 46 outer: 4 valence: 4
(c) ca inner: 10 outer: 10 valence: 2
(d) fe inner: 12 outer: 14 valence: 2
(e) se inner: 28 outer: 6 valence: 5

a galvanic cell( aka voltaic cell) and electrolytic cell

explanation:

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i think   the answer is c hope i'm right