Which of the following statements are true fo | vedclass

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(B) For any neutral atom:$1$. The atomic number $(Z)$ is defined as the number of protons in the nucleus of an atom. In a neutral atom,the number of p

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$(ii)$ and $(iv)$

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(B) For any neutral atom:$1$. The atomic number $(Z)$ is defined as the number of protons in the nucleus of an atom. In a neutral atom,the number of protons equals the number of electrons. Thus,Atomic number $=$ number of protons $=$ number of electrons. Statement $(iv)$ is true.$2$. The mass number $(A)$ is defined as the sum of the number of protons and the number of neutrons present in the nucleus. Thus,Mass number $=$ number of protons $+$ number of neutrons. Statement $(ii)$ is true.$3$. Statement $(i)$ is incorrect because the atomic number is not the sum of protons and electrons.$4$. Statement $(iii)$ is incorrect because atomic mass is not defined as the equality of protons and neutrons.Therefore,statements $(ii)$ and $(iv)$ are correct.

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