Hydroiodic acid will lose its proton readily, thus is a stronger acid than the other halogen acids. Due to its larger size, the bond length between the H-I atoms increases and results in the decrease of bond strength. HI is the strongest acid among the halogens. The order of acidity of the acids thus formed is the opposite of the reactivity order. The hydrogen halides are formed through covalent bonding. Therefore, the correct order of reactivity of halogens towards hydrogen will be $$. Therefore, fluorine is the most reactive and iodine is the least. We know that fluorine lies on the top in Group 17 followed by chlorine, bromine and iodine. Therefore on moving down the group, reactivity decreases. Halogens react directly with hydrogen forming acids like hydrochloric acid, hydrobromic acid, hydroiodic acid and hydrofluoric acid.Īs we know, the atomic radius increases down the group and due to this, the nuclear attraction faced by the valence shell electrons of the atom decreases, also down the group electronegativity decreases as, a smaller negative ion will have higher tendency to attract a proton towards itself than a bigger atom. Gaining one electron gives them the stable noble gas configuration thus, the react readily with the Group 1 and 2 elements.Īs mentioned above, halogens react readily with Group 1 and 2 elements and as hydrogen sits in Group 1, they react with hydrogen too. Halogens are highly electronegative and they have 7 electrons in their valence shells. These halogens exist as a diatomic molecule. They belong to Group 17 which we also know by the name halogen group. Higher the electronegativity, higher will be the tendency of the halogens to protonate, thus it will have a higher reactivity towards hydrogen than other halogens.įluorine, chlorine, bromine and iodine are known as the halogens. Activity Series of Metals: The electrochemical, electromotive, or activity series of the elements is formed when the electrodes (metals and nonmetals) in contact with their ions are ordered on the basis of the values of their standard reduction potentials or standard oxidation potentials. Hint: Reactivity of the halogens depends on their electronegativity.
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