Fill in the blanks:
1. The major component of the matte is ………
2. The modern periodic table is based on ………
3. The valency of alkali metals is ……
4. The unreactive elements are present in group ………
5. In the 2nd period, the smallest atom is ………
6. The size of a cation is ……. than the neutral atom.
7. ….. is the unit of ionization energy.
8. The ionization energy ……… down the group in the periodic table.
9. The electron affinities of noble gases are ………
10.……. is the process of extracting the ore from the Earth’s crust.
