Question

State the main helpful features of the long form of the periodic table.

Answer 1

Long-form of the periodic table has 7 periods horizontal rows and 18 groups vertical columns and properties show regular gradations in periods and also in groups, i.e.

Electronegativity	→	Increases in a period
	↓	decreases in a group
Non-metallic character	→	Increases in a period
	↓	decreases in a group
Size of an atom	→	decreases in a period
	↓	Increases in a group

and so on.