UPSC NDA I 2022 General Ability Solved Paper

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Question : 62 of 150

Marks: +1, -0

The mass number of argon is 40 . Which one of the following statements is correct?

[NDA I 2022]

The number of protons in argon is 22
The number of neutrons in argon is 18 .
The number of electrons in argon is 18 .
The sum of numbers of protons and electrons in argon is 40 .

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