Question

(1) DISCUSS THE CONSTRUCTION OF THE LONG FORM OF THE PERIODIC TABLE?

Answer 1

THE CONSTRUCTION OF THE LONG FORM OF THE PERIODIC TABLE ARE:-

(i) This periodic table has 18 vertical columns called the groups, which are numbered from 1 to 18.

(ii) Elements of group 1, 2 and 13 to 17 are called main group or typical or representative elements. Elements of group 1 and 2 are also known alkali metals and alkaline earth metals respectively.

(iii) Elements of group 3 to 12 are called transition elements.

(iv) Lanthanoids (elements with atomic number 58 to 71) and actinoids (elements with atomic number 90 to 103) are placed in two separate rows below the periodic table in order to avoid the unnecessary sidewise expansion of the periodic table.

(v) This periodic table contains seven horizontal rows, known as periods.