Which of the following statements are true fo | vedclass

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Question

(B) For a neutral atom,the atomic number is defined as the number of protons present in the nucleus,which is also equal to the number of electrons orb

Vedclass · Accepted Answer

$(ii)$ and $(iv)$

Vedclass · Answer

(B) For a neutral atom,the atomic number is defined as the number of protons present in the nucleus,which is also equal to the number of electrons orbiting the nucleus. Thus,statement $(iv)$ is correct.The mass number of an element is defined as the sum of the number of protons and the number of neutrons present in the nucleus of an atom. Thus,statement $(ii)$ is correct.Statement $(i)$ is incorrect because the atomic number is not the sum of protons and electrons.Statement $(iii)$ is incorrect because atomic mass is not equal to the number of protons or neutrons.Therefore,statements $(ii)$ and $(iv)$ are true.

Similar Questions

Give reasons for the following:
$(a)$ Isotopes of an element are chemically similar.
$(b)$ An atom is electrically neutral.
$(c)$ Noble gases show least reactivity.
$(d)$ Nucleus of an atom is heavy and positively charged.
$(e)$ Ions are more stable than atoms.

What was Bohr's postulate on the revolution of electrons in the orbits of an atom?

Calculate the number of neutrons present in the nucleus of an element $X$ which is represented as $^{31}_{15}X$.

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Give reasons for the following:
$(a)$ In potassium and calcium,the filling of electrons in the $N$-shell starts after the $M$-shell has acquired $8$ electrons,although the $M$-shell can accommodate up to $18$ electrons. Why?
$(b)$ There is a difference between mass number and atomic mass.

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