What are isobars? Give one example.
(N/A) Isobars are atoms of different elements that have the same mass number but different atomic numbers.
For example,${ }_{18}^{40} Ar$ and ${ }_{19}^{40} K$ are isobars because both have a mass number of $40$ but different atomic numbers ($18$ and $19$ respectively).
For example,${ }_{18}^{40} Ar$ and ${ }_{19}^{40} K$ are isobars because both have a mass number of $40$ but different atomic numbers ($18$ and $19$ respectively).
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The electronic configuration of an element $X$ is $2, 8, 2$.
$(a)$ Find the number of electrons present in the atom of element $X$.
$(b)$ Write the atomic number.
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$(d)$ Find out the valency of the element $X$.
$(a)$ Find the number of electrons present in the atom of element $X$.
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