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Q.

Which of the following elements have the same number of protons and neutrons in their atom?

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a

Hydrogen

b

Argon

c

Beryllium

d

Carbon-12

answer is C.

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Detailed Solution

Carbon – 12 has 6 protons and 6 neutrons of its nucleus.

  612CA=12  and  Z=6

n=AZ126=6

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Which of the following elements have the same number of protons and neutrons in their atom?