Answer:
(a) Halogens have five electrons in
outer subshell, i.e., outer configuration ns^'np5. Examples are\[F,\text{
}Cl,\text{ }Br,\text{ }I,\text{ }At\], etc.
(b) Alkaline earth
metals have the tendency to lose two electrons. Examples are: \[Mg,\text{
}Ca,\text{ }Sr,\text{ }Ba\]and Ra.
(c)
Chalcogens have the tendency to gain two electrons. Examples are: O, S
and Se.
(d) Group 17
(halogen group) consists of metal,
non-metal, liquid
as well as gas at room temperature.
F (gas and
non-metal), \[\text{Cl}\](gas and non-metal)
Br (liquid and
non-metal), \[I\](solid and metal)
At (Solid and metal)
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