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 $(C)$.

$(i) \ _{26}Fe^{54}, \ _{26}Fe^{56}, \ _{26}Fe^{58}$	$(a) \ \text{Isotopes}$
$(ii) \ _1H^3, \ _2He^3$	$(b) \ \text{Isotones}$
$(iii) \ _{32}Ge^{76}, \ _{33}As^{77}$	$(c) \ \text{Isoelectronic}$
$(iv) \ _{92}U^{235}, \ _{90}Th^{231}$	$(d) \ \text{Isobars}$
$(v) \ _1H^1, \ _1D^2, \ _1T^3$

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

Similar Questions

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