Sodium, Potassium, and the rest vertically below it on Periodic Table.
Argon belongs to group VIII, the noble gas family. Elements in group VIII are the most uncreative elements, thus it is safe to store reactive substances in them because they will not react with the reactive substance.
The most reactive halogen, and one of the most reactive of all the elements, is fluorine. Reactivity in the halogen family continues in order from most reactive to least reactive with chlorine, bromine, iodine, and astatine.
The alkali and alkaline earth metals are the least electro negative elements, and the halogens are the most electro negative elements.
The most reactive non-metals are the halogens, group 17.
The most reactive groups are alkali metals and halogens.
The most reactive nonmetal is fluorine
halogenes
The noble gases are the least reactive among all chemical elements.
The noble gases are the least reactive among all chemical elements.
alkali metals
halogen
halogen
S block has the most reactive elements. The groups 1 and 2 belongs to the s block.
Argon belongs to group VIII, the noble gas family. Elements in group VIII are the most uncreative elements, thus it is safe to store reactive substances in them because they will not react with the reactive substance.
The Zinc Family also known as group IIB is the second least reactive I believe. The least reactive family is the one with a full p sublevel, the noble gases, the next least reactive would be the family with a full d sublevel. Since group IIB has a full d sublevel, it must be the next least reactive family.
Their ionization potentials are very low.
Alkali metals in the first group compose the most reactive family of metals.