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Q.

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


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a

20

b

21

c

17

d

37 

answer is A.

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Detailed Solution

Given: The element's atomic number is 17
Elemental mass number = 37
There are 17 electrons.
Protons and electrons have an equal number, as we all know.
Consequently, there are 17 protons.
Now, mass number equals the sum of the protons and neutrons.
17 + number of neutrons = 37
37 - 17 = number of neutrons
Neutron count is 20.
Therefore, there are 20 neutrons in the nucleus.
 
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