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Question

The ion of an element has 3 positive charges. The mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?


A

13

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B

10

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C

14

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D

16

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Solution

The correct option is B

10


The correct option is (B).

Explanation of the correct option:

Given data-

positive charge = 3

Mass number = 27

The number of neutrons=14

Mass Number = Number of protons + Number of neutrons

27 = Number of protons + 14

Number of protons= 27-14=13

Number of protons = Number of electrons =13

Since the atom is not electrically neutral, it has a positive charge 3

Then the number of electrons in an ion = 13-3=10

Hence the number of electrons in the ion is10.


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