Question

write the number of periods and groups in the modern periodic table how does the metallic character of elements vary on moving (1) from left to right in a period and (2) down a group give the reason to justify your answer

Answer 1

the modern periodic table has 18 groups and 7 groups.when we move form left to right along a period the metallic properties decreases ,whereas the metallic character increases along a group moving top to down as metallic properties is measured by tendency to lose electrons readily,moving down a group metals lose electron easily as the force between the nucleus and the electrons decreases the metals lose their electrons easily.