Answer
Following are the common properties of Alkalis: -
a. They have low densities, melting and boiling points as compared to other metals.
b. They are soft and malleable.
c. Reactivity and atomic radii increases down the group
d. Their reaction with water is vigorous, resulting in Metal Hydroxide and hydrogen.
e. They also react vigorously with oxygen forming metal oxides.
f. Lithium, Sodium & Potassium react with Bromine & Iodine to form Salt.
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