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28 June, 23:44

Which is/are true?

[mark all correct answers]

a. Li has valence electrons in the n = 1 energy level.

b. Si has valence electrons in the n = 3 energy level.

c. Ga has valence electrons in the n = 3 energy level.

d. Xe has valence electrons in the n = 5 energy level.

e. P has valence electrons in the n = 2 energy level.

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Answers (1)
  1. 29 June, 02:18
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    b. Si has valence electrons in the n = 3 energy level.

    d. Xe has valence electrons in the n=5 energy level

    Explanation:

    A silicon atom has 14 electrons and 14 protons in its structure. Therefore it has a simple electron configuration of 2.8.4

    It therefore has 3 energy levels. The outermost 4 electrons are the valence electrons.

    A xenon has an electron configuration of 2.8.18.18.8 = 5 energy levels. The outermost 8 electrons are the valence electrons.
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