The number of valence electrons present in Sodium is

1

Electronic Configuration of Sodium (Na):

• Atomic Number: 11
• Electron Distribution:
  • First Shell (K): 2 electrons
  • Second Shell (L): 8 electrons
  • Third Shell (M): 1 electron

Valence Electrons:

• The electrons in the outermost shell are termed valence electrons.
• For sodium, the outermost shell (M) contains 1 electron.
• Therefore, sodium has 1 valence electron. :contentReference[oaicite:0]{index=0}

Valency of Sodium:

• Valency refers to an atom's ability to bond with other atoms.
• Sodium tends to lose its single valence electron to achieve a stable electron configuration, similar to the noble gas neon.
• By losing this electron, sodium forms a Na⁺ ion with a stable octet in its outer shell. :contentReference[oaicite:1]{index=1}
• Thus, the valency of sodium is +1.