Nonmetals lie on the_________of the periodic table.

There are __________ periods in the periodic table

Transition metals lie in the periodic table between groups

The placenta is formed from The________of the embryo and the________of mother.

The placenta is formed from The________of the embroy and the________of mother.

Assertion : Separation of Zr and Hf is difficult. Reason : Because Zr and Hf lie in the same group of the periodic table.