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- 1. How many blocks are there in the periodic table ? What are they ?
- 2. What are metalloids ?
- 3. Name any 2 metalloids.
- 4. What is ionization energy ?
- 5. Define valency.
ANSWERS
- 1. There are 4 block in the periodic table namely s,p,d and f.
- 2. Elements lying between metals and nonmetals in the periodic table are metalloids.
- 3. Si, Ge
- 4. The amount of energy required to liberate the most loosely bound election from the outermost shell of an isolated gaseous atom of an element is called ionizationenergy.
- 5. The combining capacity of an element is called valency.