The atomic number of an element represents:

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(A) The atomic number $(Z)$ of an element is defined as the total number of protons present in the nucleus of its atom.In a neutral atom,the number of

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Number of protons in the nucleus

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(A) The atomic number $(Z)$ of an element is defined as the total number of protons present in the nucleus of its atom.In a neutral atom,the number of protons is equal to the number of electrons.The number of neutrons is calculated as the difference between the mass number $(A)$ and the atomic number $(Z)$.For example,in ${}_{17}^{37}Cl$,the atomic number is $17$,which means there are $17$ protons and $17$ electrons,while the number of neutrons is $37 - 17 = 20$.

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

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