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Question

A dipositive ion has an electronic arrangement 2,8,8. Find out the number of electrons, protons, and neutrons in that element if its mass number is 40.

A
20,18,22
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B
20,20,20
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C
18,20,22
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D
20,20,18
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Solution

The correct option is A 20,20,20
Number of electrons in the dipositively charged cation are 18.

So protons will be 20 and number of neutrons will be 4020=20.
Therefore number of protons, neutrons and electrons in the element are 20, 20 and 20 respectively.

Therefore, option B is correct.

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