The total number of neutrons in dipositive zinc ions with mass number $70$ is:

34

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40

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36

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38

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Solution

The correct option is A $40$
No. of neutrons in ${Z n}^{2 +}$ -

Atomic weight $= 70$
Atomic number $= 30$
Number of neutrons $=$ At. wt. $-$ At. no. $= 70 - 30 = 40$

Hence, the total number of neutrons in dipositive zinc ions with the mass number $70$ is $40$ .

So, the correct option is $B$

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The total number of neutrons in dipositive zinc ions with mass number 70 is:

The correct option is A 40No. of neutrons in Zn2+-Atomic weight =70Atomic number =30Number of neutrons = At. wt. − At. no. =70−30=40Hence, the total number of neutrons in dipositive zinc ions with the mass number 70 is 40.So, the correct option is B

The total number of neutrons in dipositive zinc ions with mass number $70$ is:

The correct option is A $40$
No. of neutrons in ${Z n}^{2 +}$ -

Atomic weight $= 70$
Atomic number $= 30$
Number of neutrons $=$ At. wt. $-$ At. no. $= 70 - 30 = 40$

Hence, the total number of neutrons in dipositive zinc ions with the mass number $70$ is $40$ .

So, the correct option is $B$