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Which of the following elements has the fewest valence electrons? beryllium boron carbon lithium The answer is lithium but someone had the same question and someone answered wrong. Lithium only has on valence electron while beryllium has 2, boron has 3 and carbon has 4 making lithium the correct answer

Craig Stewart

in Chemistry

1 answer

1 answer

Ralph Lopez on November 9, 2018

The answer is: the lithium has the lowest number of valence electrons.1) the Electronic configuration of the lithium: ₃Li: 1s2 2s1, which has one valence electron in the 2s orbital.2) the Electronic configuration of beryllium: ₄Be: 1s2 2s2, has two valence electrons in the 2s orbital.3) the Electronic configuration of boron: ₅B: 1s2 2s2 2p1, which has three valence electrons in 2s and 2p orbitals.4) the Electronic configuration of the carbon: ₄C: 1s2 2s2 2p2, has four valence electrons in 2s and 2p orbitals.

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