Question

Answer the question, What are
(i) free fall,
(ii) acceleration due to gravity
(iii) escape velocity
(iv) centripetal force ?

Answer 1

According to the alkali metal facts, it contains a single electron in the valence shell. It can lose the electron to become the positive ion.

Therefore, the metals react with the dilute acids to release hydrogen and form salts. In the reaction process they get oxidized by the sulphate ion.

Alkali metals are very reactive, therefore they are not kept in the natural state in the air or else they might burn with oxygen.

Some of the elements are sodium and potassium.