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What is the common molecular formula of compound formed between alkali metals with halogens

Posted by Harini Rahul 7 years, 7 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 7 years, 7 months ago

Alkali metals react vigorously with halogens to form ionic metal halides of the general Formula , MX where M stands for metal and X for the halogens.
2 M + X₂———> 2 MX
The reactivity of alkali metal towards a particular halogen increases as we move down the group from Li to Cs due to a decrease in the ionization enthalpy or increase in the electropositive character of the metal. Potassium reacts with chlorine more vigorously than sodium.
Reactivity of halogens towards a particular alkali metal decreases from F₂ to I₂ i.e.F₂ > Cl₂ > Br₂ > I₂.

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