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# Effective nuclear charge of an element with three valence electrons is $2.60$ what is the atomic number of elements?

Last updated date: 25th Mar 2023
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Hint: The effective nuclear charge is the net positive charge experienced by an electron. It is possible to determine the strength of the nuclear charge by the oxidation number of the atom. Most of the physical and chemical properties of the elements can be explained on the basis of electronic configuration.

The effective nuclear charge is the net positive charge experienced by an electron in a poly electronic atom. The term "effective" is used because the shielding effect of negatively charged electrons prevents higher orbital electrons from experiencing the full nuclear charge of the nucleus due to the repelling effect of inner-layer electrons.
We are given that, effective nuclear charge is $2.60$ and contains three valence shell electrons.
Thus, the minimum number of main shells for the given element are two.
So the electronic configuration will be $1{s^2},2{s^2},2{p^1}$
so the total number of electrons is $5$ .
It is the same for the neutral atom.
Therefore, number of electrons$=$Atomic number
So, the atomic number of the element is $5$.

$-$Size of atom;
$-$The nuclear charge;
$-$The screening effect of the inner shells.
$-$The extent to which the outermost electron penetrates into the charge cloud set up by the inner lying electron