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Alkalis are defined as alkalis because the have a high pH (hydrogen potential). This means they are willing to accept hydrogen ions and therefore give off electrons. Halogens are defined as halogens because they are in group seven of the periodic table which means they are missing one electron from their outer shell. Alkalis react well with halogens because of alkalis wanting to give away electrons and halogens wanting to accept electrons, forming ionic bonds.

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Alkali metals have one electron in their outer shell that they want to lose, while halogens have seven electrons in their outer shell and want to gain one electron to complete their octet. When an alkali metal reacts with a halogen, the alkali metal readily gives up its electron to the halogen, forming an ionic bond between the two ions. This transfer of electrons provides stability for both elements, leading to the reaction.

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10mo ago
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Q: What cause Alkali and Halogen to react?
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