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Atomic Number and Mass Number

The number of...

Question

The number of electrons and neutrons in an element are 18 and 20 respectively. Its mass number is

A

2

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B

37

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C

17

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D

38

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Solution

The correct option is D 38
Number of electrons = 18
Number of neutrons = 20
Atomic number =number of protons= number of electrons = 18
Number of neutrons = mass number – atomic number
So, mass number = 38

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Atomic Number and Mass Number

Standard XIII Chemistry

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