Arrange the elements of 3rd period Sodium to Argon. Pick out the elements with:
1. Ar has highest ionization energy value of 3930.8 k j mol-1
2. Na is the most reactive metal.
3.Al is the least reactive one.
(a) Lithium, sodium, potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements?
(b) Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common?