So arranging them in an increasing order of nuclear charge experienced by electrons in shell n=3 is Mg < P < K < Ti < Rh
Nuclear Charge is the force of attraction that is exerted on the electron by the nucleus due to its positive charge.
Since the nuclear charge depends on the number of protons present in the nucleus thus it is based on the atomic number of the element.
When looking at the periodic table we see that the atomic number increases down a group but the atomic radius also increases as we go down the group.
So the effective nuclear charge that is experienced by the electrons especially in the outer shells decreases down the group.
We know that
potassium K has the atomic number 19,
Magnesium Mg has the atomic number 12,
phosphorus P has the atomic number 15,
Rhodium rh has the atomic number 45,
Titanium ti has the atomic number 22
So arranging them in an increasing order of nuclear charge experienced by electrons in shell n=3 is Mg < P < K < Ti < Rh.
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