Chemistry
(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
Periodic Table
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Answer
(a) Lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr) are alkali metals. They have 1 electron in their outermost orbit.
(b) (i) Alkali metal like sodium reacts rapidly with oxygen forming metal oxide
4Na + O2 ⟶ 2Na2O
(ii) Alkali metal like sodium reacts with water violently and produces its hydroxide and hydrogen
2Na + 2H2O ⟶ 2NaOH + H2
(iii) Alkali metal react violently with dil. HCl and dil. H2SO4 to produce hydrogen
2Na + 2HCl ⟶ 2NaCl + H2
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