Correct the statements.

(i) Elements in the same period have the same valency.

(ii) Valency depends upon the number of shells in an atom.

(iii) Copper and zinc are representative elements.

(iv) Transition elements are placed at extreme right of the periodic table.

What do you understand by ?

(i) Periodicity

(ii) Typical elements

(iii) Orbits

Name the (i) metals (ii) metalloids and (iii) non-metals in the first twenty elements.

Fluorine, Chlorine and Bromine are put in one group on the basis of their similar properties.

(i) What are those similar properties ?

(ii) What is the common name of this group or family ?