Question

Among the following, the group which represents a collection of iso electronic species is (atomic number of Cs=55 and Be =35)​

Answer 1

Answer:

N  3− ,F  − ,Na  +

Explanation:

N  3− ,F  − ,Na  +  represents a collection of iso-electronic species. They have 10 electrons each. Iso-electronic species have the same number of electrons. The atomic numbers of N, F and Na are 7,9 and 11 respectively.

Number of electrons in N 3− =7+3=10.

Number of electrons in F  − =9+1=10.

Number of electrons in Na  + =11−1=10.

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