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An element has 2 electrons in its N shell. What is its atomic number ?

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Question

An element has 2 electrons in its N shell.

What is its atomic number?

Short/Brief Note
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Solution

Electronic configuration of the element is:

K L M N
2 8 8 2

Atomic number of element is (2 + 8 + 8 + 2) = 20

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Chapter 1: Periodic Table, Periodic Properties and Variations of Properties - lntext Questions [Page 5]

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S.P. Singh Concise Chemistry [English] Class 10 ICSE
Chapter 1 Periodic Table, Periodic Properties and Variations of Properties
lntext Questions | Q 16. (i) | Page 5
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