A) \[19\] protons \[+\,\,20\] neutrons \[+\,\,19\] electrons
B) \[19\] protons \[+\,\,20\] neutrons \[+\,\,20\] electrons
C) \[20\] protons \[+\,\,19\] neutrons \[+\,\,20\] electrons
D) \[20\] protons \[+\,\,20\] neutrons \[+\,\,19\] electrons
Correct Answer: A
Solution :
\[_{19}^{30}K\]gives the mass number\[(A)=39\] Number of protons in a neutral atom\[(Z)=\] Number of electrons\[=19\]. No. of neutrons\[(N)=A-Z\]\[=39-19=20\]You need to login to perform this action.
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