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+
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+
Atoms and ions having
the same number of electrons are called isoelectronic species.
(i) F– ion has 9 + 1 = 10 electrons. Thus,
the species isoelectronic with it will also have 10 electrons. Some
of its isoelectronic species are Na+ ion (11 – 1 =
10 electrons), Ne (10 electrons), O2– ion (8 + 2 =
10 electrons), and Al3+ ion (13 – 3 = 10 electrons).
(ii) Ar has 18 electrons. Thus, the species isoelectronic
with it will also have 18 electrons. Some of its isoelectronic
species are S2– ion (16 + 2 = 18 electrons), Cl–
ion (17 + 1 = 18 electrons), K+ ion (19 – 1 =
18 electrons), and Ca2+ ion (20 – 2 = 18 electrons).
(iii) Mg2+ ion has 12 – 2 = 10 electrons.
Thus, the species isoelectronic with it will also have 10 electrons.
Some of its isoelectronic species are F– ion (9 + 1
= 10 electrons), Ne (10 electrons), O2– ion (8 + 2 =
10 electrons), and Al3+ ion (13 – 3 = 10 electrons).
(iv) Rb+ ion has 37 – 1 = 36 electrons.
Thus, the species isoelectronic with it will also have 36 electrons.
Some of its isoelectronic species are Br– ion (35 +
1 = 36 electrons), Kr (36 electrons), and Sr2+ ion (38 –
2 = 36 electrons).
Atoms and ions having the same number of electrons are called isoelectronic species.
(i) F– ion has 9 + 1 = 10 electrons. Thus, the species isoelectronic with it will also have 10 electrons. Some of its isoelectronic species are Na+ ion (11 – 1 = 10 electrons), Ne (10 electrons), O2– ion (8 + 2 = 10 electrons), and Al3+ ion (13 – 3 = 10 electrons).
(ii) Ar has 18 electrons. Thus, the species isoelectronic with it will also have 18 electrons. Some of its isoelectronic species are S2– ion (16 + 2 = 18 electrons), Cl– ion (17 + 1 = 18 electrons), K+ ion (19 – 1 = 18 electrons), and Ca2+ ion (20 – 2 = 18 electrons).
(iii) Mg2+ ion has 12 – 2 = 10 electrons. Thus, the species isoelectronic with it will also have 10 electrons. Some of its isoelectronic species are F– ion (9 + 1 = 10 electrons), Ne (10 electrons), O2– ion (8 + 2 = 10 electrons), and Al3+ ion (13 – 3 = 10 electrons).
(iv) Rb+ ion has 37 – 1 = 36 electrons. Thus, the species isoelectronic with it will also have 36 electrons. Some of its isoelectronic species are Br– ion (35 + 1 = 36 electrons), Kr (36 electrons), and Sr2+ ion (38 – 2 = 36 electrons).
