Question

Write the names from the description:

Hint:

Remember: Metalloids have properties intermediate between metals and non-metals, and elements with valency 4 often form covalent bonds.

Answer 1

(a) The metalloids in the second and third periods.
The metalloids in the second and third periods are:
- Second period: Boron (B)
- Third period: Silicon (Si), Germanium (Ge) (b) Non-metals in the third period.
The non-metals in the third period are:
- Third period: Oxygen (O), Nitrogen (N), and Chlorine (Cl) (c) Two elements having valency 4.
Two elements having a valency of 4 are:
- Carbon (C): It has a valency of 4 because it can form four bonds in compounds like methane (CH4).
- Silicon (Si): It also has a valency of 4 because it can form four bonds in compounds like silicon dioxide (SiO2).