Question

why should we dry and press sulphur with filterpaper before trying to cut it using a knife

Answer 1

Answer:

As already explained, the high reactivity of the metal with water is the reason for keeping it away from any contact with moisture.

However , sodium is not the most reactive among the alkali metals. In fact, potassium, rubidium and caesium react more violently with water than sodium. The reactivity of the alkali metals with water increases in the order Li < Na < K < Rb < Cs, strictly in order of increasing atomic number.

Francium, the heaviest member in the group is radioactive and extremely unstable, and therefore its chemistry is not fully studied. Its longest-lived isotope, Fr-223, has half-life period of just 21 minutes.

Explanation:

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