UPSC NDA II 2024 General Ability Paper

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Question : 118 of 150

Marks: +1, -0

For Aluminium (Al) (atomic number: 13, mass number: 27), which one among the following statements is NOT correct?

Number of electrons present in Al is 13
Number of protons present in Al is 13
Number of neutrons present in Al is 14
The valency of Al is 2

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