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Electronic configuration

An atom has e...

Question

An atom has electronic configuration 2, 8, 7.
What is the atomic number of this element?

A

17

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B

21

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C

7

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D

10

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Solution

The correct option is A 17
The atomic number of this element is 2+8+7=17.

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Q. An atom has electronic configuration 2, 8, 7. To which of the following elements would it be chemically similar? (Atomic numbers are given in parentheses.)
N (7) F (9) P (15) Ar(18).

Q. An element has an atomic number of 107. What is its electronic configuration and what will be its group number?

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