zahkaria1223badiieez
27.04.2021 •
Chemistry
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Ответ:
6.B
7.B
Explanation:
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Ответ:
Non-valence electrons: 1s22s22p6. Therefore, we write the electron configuration for Na: 1s22s22p63s1. What is the highest principal quantum number that you see in sodium's electron configuration? It's n = 3, so all electrons with n = 3 are valence electrons, and all electrons with n < 3 are non-valence electrons.