Question

An otom of an element has full K and L shell and has five electrons in its M shell .What is atomic number​.
plzz and fast​

Answer 1

Answer:

15

Explanation:

By electronic configuration before going to the M shell the shells K and L should be completely filled. Electrons that can be occupied by K and L shells are 2 and 8 respectively. So, the atomic number of the element X is 15 because 2 + 8 + 5 = 15.

Answer 2

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