Question

how many groups and periods are there in the morden periodic table? how do the atomic size and metallic character elements vary as we move: down a group and
from left to right in a period​

Answer 1

Answer:

There are 7 periods and 18 groups in the modern periodic table. Metallic character decreases from left to right across a period because as atomic size goes on decreasing so tendency to lose electrons decreases. But down a group metallic character increases as atomic size increases and tendency to lose electrons increases.

Explanation:

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Answer 2

Answer:

There are 18 group and 7 periods in modern periodic table....

Atomic size increase as we move down to a group

and decrease from left to right...

metallic character decreases from left to right and increase on moving down the group...