Question

write the number of groups and periods in Modern Periodic Table how do the atomic size and metallic character of elements vary as we move in this table, down a group and from left to right in a period?

Answer 1

there are 18 groups and 7 periods in modern period table . metallic character decreases in the period but increases in the group.atomic size increases in the groups but decreases in the periods.
I hope so it will be useful
please mark it as brainliest

Answer 2

Answer:

Explanation:

There are 18 groups and 7 periods in the modern periodic table. (a) The atomic size and metallic character of elements increase down a group. (b) The atomic size and metallic character of elements decrease from left to right in a period. the number of periods is 7 and the number of groups is 18.