Question

Give two examples
1) Elements having symbols starting with the letter C
2) Elements with two letters in their chemical symbol
3) Monovalent elements
4) Non-metals
5) Metalloids​

Answer 1

ANS1. Calcium , Cerium

ANS2. Co - Cobalt , Cu - Copper

ANS3. Sodium , Chlorine

ANS4. Phosphorus , Sulphur

ANS5. Boron , Silicon

Answer 2

Explanation:

Calcium , cerium

Co - Cobalt , Cu - copper

Sodium , chlorine