Question

What are the names of the 18 elements? What are their valence electrons, their valency, and their electronic configuration?

Answer 1

The 18 elements commonly referred to are the noble gases in the periodic table. Here are their names, valence electrons, valency, and electronic configurations:

1. Helium (He)

   • Valence Electrons: 2
   • Valency: 0
   • Electronic Configuration: 1s²

2. Neon (Ne)

   • Valence Electrons: 8
   • Valency: 0
   • Electronic Configuration: [He] 2s² 2p⁶

3. Argon (Ar)

   • Valence Electrons: 8
   • Valency: 0
   • Electronic Configuration: [Ne] 3s² 3p⁶

4. Krypton (Kr)

   • Valence Electrons: 8
   • Valency: 0
   • Electronic Configuration: [Ar] 3d¹⁰ 4s² 4p⁶

5. Xenon (Xe)

   • Valence Electrons: 8
   • Valency: 0
   • Electronic Configuration: [Kr] 4d¹⁰ 5s² 5p⁶

6. Radon (Rn)

   • Valence Electrons: 8
   • Valency: 0
   • Electronic Configuration: [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁶

7. Oganesson (Og)

   • Valence Electrons: 8
   • Valency: 0
   • Electronic Configuration: [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁶

Note that the noble gases are chemically inert, meaning they have a valency of 0 because their outermost energy levels are fully occupied with electrons. Their electronic configurations reflect the filling of energy levels and subshells in accordance with the periodic table.