Question

define mass defect.Obtain an expression for mass defects in case of a nucleus of an atom zX4​

Answer 1

Answer:

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Explanation:

The effective nuclear charge Z

eff

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