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The atomic weight of an element is 39. I...

The atomic weight of an element is 39. It contains neutrons one more than the protons. The number of protons, neutrons and electrons are

A

19, 20, 19

B

19, 19, 20

C

20, 21, 19

D

20, 19, 20

Text Solution

Verified by Experts

The correct Answer is:
A
Mass number = Number of protons + Number of neutrons
`39= x+ (x+1)` (x= Number of protons)
`therefore 2x=39-1 =38`
`therefore x= 19`
Electrons = 19
Protons = 19
Neutrons = 20
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