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Question

One atom of K3919 contains:

(P-proton, n-neutron and ¯e​-electron)


A
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B
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C
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D
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Solution

The correct option is A

K3919 contains P = 19; ¯e=19;n=20

Representation of a Element E

EMassNo.AtomicNo.

Number of neutrons = Mass number-Atomic number

=39-19=20


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