The property trends in general on moving from left to right in a period of the periodic table are :
- Number of valence electrons โ increases by one
- Atomic radius โ decreases.
- Ionization potential โ increases.
- Electron affinity โ increases (exception, electron affinity is zero for noble gases).
- Non-metallic character โ increases.
- Metallic character โ decreases
- Electronegativity โ increases (with the exception of noble gases, they have complete octet so do not attract electrons to itself).