(i) Element A is from the fourth long period (Rb-Xe). Element A has two principal oxidation states. Its lowest oxidation state chloride behaves as both a Lewis acid and a Lewis base, while its highest oxidation state chloride is a colourless liquid which reacts rapidly with water. (ii) Element B is from the second long period (Na-Ar). Its hydride is a solid, which reacts violently with water. Aqueous solutions of its chloride have a pH less than 7.0.

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Chapter1: Chemical Foundations
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could you identify A and B?

(i) Element A is from the fourth long period (Rb-Xe). Element A
has two principal oxidation states. Its lowest oxidation state
chloride behaves as both a Lewis acid and a Lewis base, while its
highest oxidation state chloride is a colourless liquid which reacts
rapidly with water.
(ii) Element B is from the second long period (Na-Ar). Its hydride is
a solid, which reacts violently with water. Aqueous solutions of
its chloride have a pH less than 7.0.
Transcribed Image Text:(i) Element A is from the fourth long period (Rb-Xe). Element A has two principal oxidation states. Its lowest oxidation state chloride behaves as both a Lewis acid and a Lewis base, while its highest oxidation state chloride is a colourless liquid which reacts rapidly with water. (ii) Element B is from the second long period (Na-Ar). Its hydride is a solid, which reacts violently with water. Aqueous solutions of its chloride have a pH less than 7.0.
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