The covalent radii is the distance between the two atoms of a molecule

The atomic radii of hydrogen is lesser than helium

The metals will otherwise called as crystal radius

The atomic radii decreases down the group

The vanderwals radii is the distance between the two similar atoms of different molecules

The 3d electrons had more energy than 4s electrons

The valency of a group is same

The iupac name of element 102

The periodicity is due to same electronic configuration

The valency of halogen is 1

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