1
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Question

# An element has atomic number 17 and mass number 37. There are 17 electrons outside the nucleus. Find the number of neutrons in it.

A
20
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B
21
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C
17
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D
37
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Solution

## The correct option is A 20(A) 20Given - Atomic number of element = 17 Mass number of element = 37 Number of electrons = 17As we know, number of protons is equal to number of electrons.so, number of protons = 17now, Mass number = number of protons + number of neutrons 37 = 17 + number of neutrons number of neutrons = 37 - 17 number of neutrons = 20So, the number of neutrons in the nucleus = 20.

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