Which element has electrons in three energy levels? A. B B. Li C. Si D. SC

Question

Which element has electrons in three energy levels?

A. B
B. Li
C. Si
D. SC

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3 days 2021-07-22T03:44:43+00:00 1 Answers 0 views 0

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    2021-07-22T03:45:52+00:00

    B. Li lithium answer seems correct

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )