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Question

The ion of an element has 3 units positive charge. 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


Given, mass number = 27 and number of neutrons = 14
Mass number = Number of protons + Number of neutrons.
27= Number of protons + 14

Number of protons =2714=13

Now, we know that for a neutral atom,
Number of protons = Number of electrons
Given, that the ion has 3 units positive charge i.e. number of electrons is three less than the number of protons.


So, the number of electrons in the given element =133
=10


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