1.

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

Answer»

`.^(40)Ca^(2+) and .^(40)AR`
`.^(39)K^(+) and .^(40)K^(+)`
`.^(24)Mg^(2+) and .^(25)Mg`
`.^(23)Na and .^(24)Na^(+)`

SOLUTION :`.^(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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