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Which of the following does not increase regularly?

Which of the following does not increase regularly?

Options

(a) mass number
(b) atomic number
(c) packing fraction
(d) binding energy

Correct Answer:

packing fraction

Explanation:

Mass number, atomic number and binding energy increases regularly whereas packing fraction does not increase regularly. Packing fraction (f) is the difference between the exact nuclear mass M of a nucleus and its mass number A, divided by the mass number and it is given by f = (M – A) / A The curve of f × 10⁴ against A shows a minimum at about A = 50, the packing fraction is negative for mass numbers between 16 and 180 and packing fraction is positive for mass number 16 > A > 180

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