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(a) What are 'valence electrons'?
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(a) What are 'valence electrons'?
For each element, indicate the number of valence electrons, core electrons, and unpaired electrons in the ground state: (c) fluorine.
For each element, indicate the number of valence electrons, core electrons, and unpaired electrons in the ground state: (a) sodium (b) sulfur.
(b) What are 'core electrons'?