How many groups and periods are there in the periodic table?
how many periods and groups are there in mendeleev periodic table ?
How many periods and groups are there in the Modern Periodic Table?
How many groups and periods are there in the long form periodic table? How are these numbered? How many elements are there in each period?
State Mendeleev's periodic law. How many periods and group are there in the long form of the periodic table?
how many periods and groups are present in medeleev's periodic table??