Which of the following statements are true fo | vedclass

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(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

An ion $X^{2+}$ contains $18$ electrons and $20$ neutrons. Calculate the atomic number and mass number of element $X$. Name the element $X$.

An atom with atomic number $9$ and mass number $19$ will have the following constituents:

State reasons for the following statements:
$(i)$ Some elements possess fractional atomic mass.
$(ii)$ Isotopes of an element have similar chemical properties.
$(iii)$ Noble gases are inert.

$(a)$ Define the following terms with one example each:
$(i)$ Isotope
$(ii)$ Isobar
$(b)$ Name the elements whose isotopes are used in:
$(i)$ Nuclear Reactor
$(ii)$ Treatment of cancer

Give a reason to explain why
$(a)$ isotopes of an element show identical chemical properties?
$(b)$ the atomic masses of elements are in fractions?
$(c)$ atoms combine with other atoms?

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