a)Ion Li+
The neutral state of lithium is Li3 withelectronic configuration 1s22s1. Li+ has oneelectronless
than its neutral state, and hence, electronic configuration of Li+ ion is 1s22s0.
So, its ground-state electronic configuration is 1s22s0.
b)Ion H−
Hydrogen in its neutral state has only one electron (H1) in the s−orbital. H− has two electrons (H1), having theelectronic configuration as 1s2. Hydrogen has a general tendency of losing its electron forming a cation as; H+. In H− form, it forms hydrides with electropositive elements.
Its ground-state electronic configuration is 1s2.
c)Ion N3−
The neutral state electron-arrangement of nitrogen is N7 with the electronic configuration 1s22s22p3. N3− has ten electrons as threemore are added to its neutral state. The electronic configuration of N3− is 1s22s22p6.
So, its ground-state electronic configuration is 1s22s22p6.
d)Ion F−
The neutral state electronic configuration of fluorine (F9) is 1s22s22p5. F− has ten electrons as onemore is added to its neutral state. It is isoelectronic with N3− ion.
So, its ground-state electronic configuration is 1s22s22p6.
e)Ion S2−
The neutral state electron-arrangement of sulphur is S16 with the electronic configuration [Ne]3s23p4. S2− has eighteen electrons astwomore are added to its neutral state. Electronic configuration of S2− is [Ne]3s23p6.
So, its ground-state electronic configuration is [Ne]3s23p6.
f)Ion Al3+
The neutral state of aluminium is Al13 withelectronic configuration [Ne]3s23p1.
Al3+ has ten electrons. The ground state electronic configuration of Al3+ is [Ne]3s03p0. It is isoelectronic with N3− and F− ions.
So, its ground-state electronic configuration is [Ne]3s03p0.
g)Ion Se2−
The ground state electron-arrangement of selenium is Se2− with the electronic configuration [Ar]3d104s24p4. Se2− has thirty-six electrons astwo more are added to its neutral state. Electronic configuration of S2− is [Ar]3d104s24p6. It is isoelectronic with Kr36.
So, its ground-state electronic configuration is [Ar]3d104s24p6.
h) Ion Br−
The ground state electron-arrangement of bromine is Br35 with the electronic configuration of [Ar]3d104s24p5. Br− has thirty-six electrons asone more added to its neutral state. Electronic configuration of Br− is [Ar]3d104s24p6. It is isoelectronic with Kr36.
So, its ground-state electronic configuration is [Ar]3d104s24p6.
i) Ion Rb+
The neutral state of rubidium is Rb37 withelectronic configuration [Kr]5s1. Rb+ has one electron less than its neutral state, and hence, its electronic configurationis [Kr]5s0. It is isoelectronic with Kr36.
So, its ground-state electronic configuration is [Kr].
j)Ion Sr2+
The neutral state of strontium is Sr38 with the electronic configuration [Kr]5s2. Sr2+ ion has two electrons less than its neutral state with an electronic configuration [Kr]. It is isoelectronic with Kr36 and Rb+.
So, its ground-state electronic configuration is [Kr].
k) Ion Sn2+
The neutral state of stannous is Sn50 with the electronic configuration [Kr]4d105s25p2. Sn2+ ion hastwo electrons less than its neutral state with an electronic configuration [Kr]4d105s25p0.
So, its ground-state electronic configuration is [Kr]4d105s2.
l)Ion Te2−
Te2− has two more electrons than its neutral state of Te52 with its ground state electronic configuration as [Kr]4d105s25p4. The electronic configuration of Te2− is [Kr]4d105s25p6. It is isoelectronic with the noble gas Xe54.
So, its ground-state electronic configuration is [Kr]4d105s25p6.
m)Ion Ba2+
The neutral state of barium is Ba56 with the electronic configuration [Xe]6s2. Ba2+ ion hastwo electrons less than its neutral state with theelectronic configuration [Xe]6s0. It is isoelectronic with Xe54 and Te2−.
So, its ground-state electronic configuration is [Xe].
n)Ion Pb2+
The neutral state of lead is Pb82 with the electronic configuration [Xe]4f145d106s26p2. Pb2+ ion has two electrons less than its neutral state. Its electronic configurationis [Xe]4f145d106s26p0.
So, its ground-state electronic configuration is [Xe]4f145d106s2.
o)Ion In3+
The neutral state of indium is In49 with the electronic configuration [Kr]4d105s25p1. In3+ ion has three electrons less than its neutral state with an electronic configuration [Kr]5d105s05p0.
So, its ground-state electronic configuration is [Kr]5d10.
p)Ion Tl+
The neutral state of thallium is Tl81 having theelectronic configuration [Xe]4f145d106s26p1. Tl+ ion has one electron less than its neutral state with an electronic configuration [Xe]4f145d106s2 with a total of eighty electrons.
So, its ground-state electronic configuration is [Xe]4f145d106s2.
q)Ion Tl3+
The neutral state of thallium is Tl81 having the electronic configuration [Xe]4f145d106s26p1. Tl3+ ion has three electrons less than its neutral state with an electronic configuration [Xe]4f145d10, having a total of seventy-eight electrons.
So, its ground-state electronic configuration is [Xe]4f145d10.