Which element has
a) the electronic configuration 2, 8, 2?
b) a total of three shells, with four electrons in its valence shell?
c) a total of two shells, with three electrons in its valence shell?
d) twice as many electrons in its second shell as in its first shell?
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Answer:
a) magnesium(Mg)
b) silicon(Si)
c) boron(B)
d) carbon(C)
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