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Q.

An element has protons whose mass is equal to 3674 times that of an electron. Identify the element 

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a

H

b

He

c

C

d

Be

answer is A.

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Detailed Solution

The mass of a proton is 1837-times that of an electron 

No. of protons = 3674/1837 = 2 

Atomic number = 2 

So the element is Helium. 

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