(a) Name the alkali metals.How many electrons(s) do they have in their outermost orbit.

(b) Take any one alkali metal and write its reaction with (i) oxygen (ii) water (iii) acid.

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Solution

The alkali metals are Lithium,Sodium,Pottasium,Rubidium,Caesium and Francium.(All metals arranged in correct order of their reactivity the last metal is radioactive and the reactivity increases as you read the names of the metal)

They have 1 electron in their outermost orbit.

b)

i) $2 N a + O_{2} ⟶ 2 N a O$

ii) $2 N a + 2 H_{2} O ⟶ 2 N a O H + H_{2}$

iii) $2 N a + H_{2} S O_{4} ⟶ N a_{2} S O_{4} + H_{2}$

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Name some alkali metals. How many electron do they have in their outermost orbit?

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