As you walk down group 1 (the alkali metals) in the routine table, the facets get an ext reactive.
You are watching: Why are the alkali metals and the halogens very reactive
As you go up group 7 (the halogens), again, the aspects become more reactive.
Why execute alkali metals get much more reactive walking down team 1?
Alkali steels from lithium to potassium get an ext reactive because the force of attraction in between the nucleus (core) and the external electron gets weaker as you go down team 1 elements.
The distance \"c\" is greater than \"a\" and the pressure of attraction in between the nucleus and also the outer shell (rings) diminishes through distance.
The much more electron shells (rings) between the nucleus and outer electron also creates shielding and also again this weakens the nuclear attraction.
The outer electron is an ext easily moved to to speak an oxygen atom, which needs electrons to complete its full outer shell.
Why perform halogens get more reactive walk upwards in team 7?
Halogens indigenous bromide to fluorine get an ext reactive because the force of attraction in between the cell core (core) and the outer electron get stronger as you walk up group 7 elements.
The street \"a\" is less than \"c\" and the pressure of attraction in between the nucleus and the external shell increases with much shorter distances.
The under electron shells (rings) between the nucleus and also the external shell (ring) also has less shielding effect and also again this rises the electron attraction.
The outer shell will an ext easily attract one more electron, which demands an electron to complete its complete outer shell, when there is an ext attractive force.
A useful mnemonic snapshot to assist you remind that:
As you walk down team 1 (the alkali metals) in the regular table, the elements get much more reactive.
As you go up group 7 (the halogens), again the aspects get much more reactive.
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Is as follows:
To remember just how the reactivity the the alkali metals and also halogens increases or decreases, put a pen in the center of the regular table and also spin the anti-clockwise.