Question

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

Answer 1

Answer:

There are 7 periods and 18 groups in modern periodic table. From moving left to right metallic character decreases as tendency to loose electron will decrease and from down the group it increases as outermost electrons are farthest away from nucleus