Question
Asked Jun 9, 2019
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2. Two elements that have the same ground-state valence shell configuration of ns np
are
a. K and Mg.
b. O and Se.
c. Al and Ga.
d. Ge and Pb.
Mg and Ca.
e.
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2. Two elements that have the same ground-state valence shell configuration of ns np are a. K and Mg. b. O and Se. c. Al and Ga. d. Ge and Pb. Mg and Ca. e.

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Potassium and magnesium, calcium and magnesium are s-block elements and it cannot have p electrons in ground state electron configuration.  Then, oxygen and selenium have more than two p electrons...

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Ge: 1s2 2s2 2p5 3s2 3p64s2 3d10 4p2 Pb: 1s2 2s2 2p5 3s2 3p5 4s2 3d10 4p5 5s2 4d05p 6s2 4f14 5d106p2

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