NCERT Class XI Chemistry Classification of Elements and Periodicity in Properties Solutions

Question : 11

Total: 40

What do you understand by isoelectronic species? Name a species that will be isoelectronic with each of the following atoms or ions.
(i) F–
(ii) Ar
(iii) Mg2+
(iv) Rb+

Solution:

Isoelectronic species are those which have same number of electrons.
(i) F– has 10 electrons. Therefore, the species N3–,O2–,Ne,Na+,Mg2+, etc., are isoelectronic with F–.
(ii) Ar has 18 electrons. Therefore, the species P3–,S2–,Cl–,K+,Ca2+, etc., are isoelectronic with Ar.
(iii) Mg2+ has 10 electrons. Therefore, the species N3–,O2–,Ne,Na+, etc., are isoelectronic with Mg2+.
(iv) Rb+ has 36 electrons. Therefore, the species Br–, Kr, Sr2+, etc., are isoelectronic with Rb+.

Go to Question:

Prev Question

Next Question