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Chemistry Structure of Atom Dual Nature of Electron Single Correct MCQ
Published on: August 13, 2026

Effective nuclear charge ( ) for a nucleus of an atom is defined as.

A
Shielding of the outermost shell electrons from the nucleus by the innermost shell electrons
B
The net positive charge experienced by electron from the nucleus
C
The attractive force experienced by the nucleus from electron
D
Screening of positive charge on nucleus by innermost shell electrons.

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The correct answer is:
B

The effective nuclear charge is the net positive charge experienced by an electron from the nucleus in a polyelectronic 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.

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