Valency of All 118 Elements with Their Electronic Configuration
Understanding the valency of elements is crucial in chemistry as it helps predict how atoms will bond with each other.

1. Hydrogen (H) - 1 Valency
- Electronic Configuration: 1s1
- Hydrogen has one valence electron, so its valency is 1.

2. Helium (He) - 0 Valency
- Electronic Configuration: 1s2
- Helium has a full outer shell, so its valency is 0.

3. Lithium (Li) - 1 Valency
- Electronic Configuration: 1s2 2s1
- Lithium has one valence electron, so its valency is 1.

4. Carbon (C) - 4 Valency
- Electronic Configuration: 1s2 2s2 2p2
- Carbon has 4 valence electrons, so its valency is 4.

5. Oxygen (O) - 2 Valency
- Electronic Configuration: 1s2 2s2 2p4
- Oxygen has 6 valence electrons, so its valency is 2.

6. Neon (Ne) - 0 Valency
- Electronic Configuration: 1s2 2s2 2p6
- Neon has a full outer shell, so its valency is 0.
This pattern continues for all the elements, where the valency is determined by the number of electrons in the outermost shell. By understanding the electronic configuration of elements, we can easily determine their valency and predict how they will react with other elements to form compounds.