While studying atomic structure, I have faced this term very often. I assume this is a very detailed type question! But if anyone can please provide just the preliminary idea about this, it will be helpful.

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    $\begingroup$ Hey there! That's a good question, however, the answer to question that user @Pritt linked carries a brief explanation of "penetration of atomic orbitals" and is presumably what you want. So, assuming you require nothing else, we'll be closing this question as a "duplicate" (we do this to reduce clutter on the site). However, if that answer does not have what you're looking for, then by all means go ahead and edit your question to include specifics and it (may) be re-opened. We look forward to your future participation on Chemistry.SE. Cheers! $\endgroup$ – paracetamol May 13 '17 at 8:23

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