Question #322522

How many valence electrons are found in this element with a configuration of 1s2 2s2 2p6 3s2 3p5?

Expert's answer

1s2 2s2 2p6 3s2 3p5;

Only 17 electrons.

Among 17 electrons, only 7 electrons are valence electrons that are situated in the outermost shell: 3s2 3p5.

Answer: 7.


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