The electron present in s subshell will show most penetration towards the nucleus
The extent to which an electron can come closer to the nucleus or the extent to which an electron can experience nuclear force is known as penetration. The ability of electron to penetrate into different subshell and shell is known as its penetration power.
The order of penetration is as follow: s>p>d>f.
Shielding effect is also known as screening effect. It is the decrease in the nuclear force experienced by the valence electron due to increase in atomic number. In the other word we can say that penetration is opposite to shielding effect.
The order of the shielding effect on the outer valence electron is as follow: s>p>d>f.
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