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The number of neutrons in dipositive zinc ion with mass number `70` is.

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The number of neutrons in dipositive zinc ion with mass number `70` is.
A. 34
B. 36
C. 38
D. 40
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Correct Answer - D
(d) No. of neutrons = Mass number - Atomic number (Ion formation never changes neutrons)
=`70 - 30 = 40`.
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