1) Sodium (Na) : 1 valence electron.
Sodium (Na) is an element with atomic number 11 and it has one valence electron (3s¹) like all alkaline metals.
Electron configuration of sodium atom: ₁₁Na 1s² 2s² 2p⁶ 3s¹.
2) Fluorine (F): 7 valence electrons.
Fluorine has atomic number 9, it means it has 9 protons and 9 electrons.
Electron configuration of fluorine: ₉F 1s² 2s² 2p⁵.
3) Vanadium (V): 5 valence electrons.
Vanadium (V) is element with atomic number 23 (23 protons and 23 electrons).
Electron configuration of vanadium atom: ₂₃V 1s² 2s² 2p⁶ 3s² 3p⁶ 3d³ 4s².
4) Argon (Ar): 8 valence electrons.
Atomic number of argon (Ar) is 18, it means that it has 18 protons and 18 electrons.
Electron configuration of argon atom: ₁₈Ar 1s² 2s² 2p⁶ 3s² 3p⁶.
5) Carbon (C): 4 valence electrons.
Electron configuration of carbon atom: ₆C 1s² 2s² 2p².