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In which one of the following pairs, the...

In which one of the following pairs, the two species are both isoelectronic and isotopic ? (At. Numbers : Ca = 20, Ar = 18, K = 19, Mg = 12, Fe = 26, Na = 11)

A

`""^(40)Ca^(2+) and ""^(40)Ar`

B

`""^(39)K^+ and ""^(40)K^+`

C

`""^(24)Mg^(2+) and ""^(25)Mg`

D

`""^(23)Na and ""^(24)Na^+`

Text Solution

Verified by Experts

The correct Answer is:
B
`""^(39)K^(+) and ""^(40)K^+` contains same number of electrons so they are isoelectronic . They have same atomic numbers but different mass number so they are also Isotopes
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