What are the similarities between alkali metals and halogens?

Answer 1

What causes these to be so reactive is the amount of electrons in the outer most level. Each level after the first (which has 2 if full) if filled will have 8 electrons. Halogens have less than that causing it to be reactive to other elements. (i don't know how many electrons it has in the outer level) The reason why it is reactive is (depending on how many electrons it has in the outer leve) because it is either trying to gain or lose those extra electrons. What causes these to be so reactive is the amount of electrons in the outer most level. Each level after the first (which has 2 if full) if filled will have 8 electrons. Halogens have less than that causing it to be reactive to other elements. (i don't know how many electrons it has in the outer level) The reason why it is reactive is (depending on how many electrons it has in the outer leve) because it is either trying to gain or lose those extra electrons.

Answer 2

Halogens have 7 valance electrons, just one short of a stable configuration. When halogens react, they often gain the 1 electron needed to have 8 valence electrons, a filled outer energy level. Because the alkali metals have one valence electron, they are ideally suited to react with the halogens.

Answer 3

they all form salts with alkali metals

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Answer 4

Fluorine and chlorine both show similar chemical behaviors because they are both in the same family, the Halogens, which are all highly reactive gases with 7 balanced electrons.

Answer 5

They have the same number of outer electrons.