Ca has atomic number 20 and atomic weight 40. | vedclass

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Question

(C) For $Ca$ atom $(_{20}Ca^{40})$:Atomic number $(Z)$ = $20$ (Number of protons = Number of electrons = $20$).Mass number $(A)$ = $40$ (Number of nuc

Vedclass · Accepted Answer

The number of protons is half of the number of neutrons.

Vedclass · Answer

(C) For $Ca$ atom $(_{20}Ca^{40})$:Atomic number $(Z)$ = $20$ (Number of protons = Number of electrons = $20$).Mass number $(A)$ = $40$ (Number of nucleons = $40$).Number of neutrons $(n)$ = $A - Z = 40 - 20 = 20$.Evaluating the options:$(A)$ Number of electrons $(20)$ = Number of neutrons $(20)$. (Correct)$(B)$ Number of nucleons $(40)$ = $2 	imes$ Number of electrons $(20)$. (Correct)$(C)$ Number of protons $(20)$ is half of the number of neutrons $(20)$. (Incorrect,as $20$ is equal to $20$,not half).$(D)$ Number of nucleons $(40)$ = $2 	imes$ Atomic number $(20)$. (Correct)Therefore,the incorrect statement is $(C)$.

$Ca$ has atomic number $20$ and atomic weight $40$. Which of the following statements is not correct about $Ca$ atom?

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