How many groups and how many periods are there is long form of periodic table?

How many groups and how many periods are there in long form of periodic table?

State modern periodic law. How many groups and periods are present in the long form of the periodic table?

Define Modern periodic law? Why many groups and periods are present in the long form of the periodic table?

How many periods are there in the Modern Periodic Table?

How many periods are there in the mendeleev 's periodic table ?

How many periods are there in the mendellevs periodic table-

How many groups and periods are there in the modern periodic table? How do the atomic size and metallic character of elements vary as we move ? (i) down a group and (ii) from left to right in a period.