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
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
Related Questions
An element A has 2 electrons in its fourth shell. State:
(a) its atomic number
(b) its electronic configuration
(c) its valency
(d) position in the periodic table
(e) is it a metal or a non-metal?
(f) is it an oxidising or reducing agent?
(a) Name the first three alkaline earth metals.
(b) Write their reactions with dil. hydrochloric acid.
(a) How do alkaline earth metals occur in nature?
(b) Write the electronic configuration of the first two alkaline earth metals.
(a) How many electrons do inert gases have in their valence shells?
(b) Name an element of group 18 which can form compounds.