$(A)$ The ion $X^{2-}$ has $10$ electrons, which means it has gained $2$ electrons to form the ion.Therefore, the number of protons in the neutral ato

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Atomic number $= 8$, Mass number $= 16$

$(A)$ The ion $X^{2-}$ has $10$ electrons, which means it has gained $2$ electrons to form the ion.Therefore, the number of protons in the neutral atom $X$ is $10 - 2 = 8$.Atomic number is equal to the number of protons, so the atomic number of $X$ is $8$.Mass number is the sum of protons and neutrons.Mass number $= \text{Number of protons} + \text{Number of neutrons} = 8 + 8 = 16$.

Class 9 Science STRUCTURE OF THE ATOM Atomic Number, Mass Number, Isotopes and Isobars

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An ion $X^{2-}$ contains $10$ electrons and $8$ neutrons. What are the atomic number and mass number of element $X$?

A
Atomic number $= 8$, Mass number $= 16$
B
Atomic number $= 10$, Mass number $= 18$
C
Atomic number $= 8$, Mass number $= 18$
D
Atomic number $= 10$, Mass number $= 16$

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STRUCTURE OF THE ATOM

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Atomic Number, Mass Number, Isotopes and Isobars

List applications of any three isotopes in various fields.

Easy

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Find the number of electrons,protons,and neutrons possessed by the alpha particles $\left({ }_{2}^{4} He ^{2+}\right)$ used in the gold leaf experiment.

Medium

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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?

Medium

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Give one point of similarity and one point of difference between isotopes of ${ }_{6}^{14} C$ and ${ }_{6}^{12} C$.

Medium

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For the symbols $H$,$D$,and $T$,tabulate the number of three sub-atomic particles found in each of them.

Medium

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An ion $X^{2-}$ contains $10$ electrons and $8$ neutrons. What are the atomic number and mass number of element $X$?

Similar Questions

List applications of any three isotopes in various fields.

Find the number of electrons,protons,and neutrons possessed by the alpha particles $\left({ }_{2}^{4} He ^{2+}\right)$ used in the gold leaf experiment.

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?

Give one point of similarity and one point of difference between isotopes of ${ }_{6}^{14} C$ and ${ }_{6}^{12} C$.

For the symbols $H$,$D$,and $T$,tabulate the number of three sub-atomic particles found in each of them.

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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?