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Question
The metals of s-block elements combine directly with halogens (X) at appropriate temperature to form halides of the
The metals of s-block elements combine directly with halogens (X) at appropriate temperature to form halides of the
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Solution
The correct option is A and type
Halogens (F, Cl, Br, I,) have 7 electrons in their outermost shells and hence their valency is -1. The metals in s-block are group I elements and group II elements. Group I elements (H, Li, Na, K, Rb, Cs, Fr) have only one electron in their outermost shell and hence their valency is +1. Now by crossing valencies we get halides of the form MX. It is due to this that group I metals form halides of the MX type. Eg: NaCl, KCl Gropu II elements (Be, Mg, Ca, Sr, Ba, Ra) have two electron in their outermost shell and hence their valency is +2. When they combine with halogens they form halides of the MX2 type by crossing of valencies.
and type
Halogens (F, Cl, Br, I,) have 7 electrons in their outermost shells and hence their valency is -1.
The metals in s-block are group I elements and group II elements. Group I elements (H, Li, Na, K, Rb, Cs, Fr) have only one electron in their outermost shell and hence their valency is +1. Now by crossing valencies we get halides of the form MX.
It is due to this that group I metals form halides of the MX type.
Eg: NaCl, KCl
Gropu II elements (Be, Mg, Ca, Sr, Ba, Ra) have two electron in their outermost shell and hence their valency is +2.
When they combine with halogens they form halides of the MX2 type by crossing of valencies.
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