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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 numbers so they are also Isotopes.
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