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An ion having a mass number 52 has 3 uni...

An ion having a mass number 52 has 3 units of positive charge. The number of neutrons in the ion exceeds the number of electrons in it by 7. The atomic number of the element is

A

28

B

22

C

26

D

24

Text Solution

Verified by Experts

The correct Answer is:
D
Let number of protons be x.
Number of electrons = x-3
` therefore ` Number of neutrons = x-3 + 7 = x + 4
mass number = Number of protons + Number of neutrons
` x+x+ 4=52 , 2 x +4 =52`
` 2x =52 -4 ,x=(48 )/(2 ) =24`
Atomic number = Number of protons (x) = 24
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