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Q.

One atom of the element contains 15 electrons, 15 protons and 16 neutrons. The mass number will be


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a

31

b

16

c

15

d

30

answer is D.

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Detailed Solution

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One atom of the element contains 15 electrons, 15 protons and 16 neutrons. The mass number will be 31 amu.
Given:
Electrons = 15,
Protons = 15 and
Neutrons = 16
We know that,
Mass number(A) = Number of protons + number of neutrons
Mass number = 15+16
Mass number = 31
 
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