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Atom

Find the no. ...

Question

Find the no. of neutrons in an atom if its mass no. is 27 and has 13 electrons in neutral state.

A

27

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B

13

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C

18

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D

14

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Solution

The correct option is D 14
For a neutral atom, number of protons = number of electrons
Mass number = Number of protons + Number of neutrons
For the given atom,
Mass number = 27
Number of protons = Number of electrons = 13
Number of neutrons = Mass number - Number of protons
Number of neutrons = 27-13
Number of neutrons =14

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