Question

how chemical activity of alkali metals and halogens varry?.​

Answer 1

. Rᴇᴀᴄᴛɪᴠɪᴛʏ ᴏғ ᴛʜᴇ ᴀʟᴋᴀʟɪɴᴇ ᴍᴇᴛᴀʟs ᴅᴇᴘᴇɴᴅs ᴜᴘᴏɴ ᴛʜᴇ ɪᴏɴɪᴢᴀᴛɪᴏɴ ᴇɴᴛʜᴀʟᴘʏ ᴏғ ᴍᴇᴛᴀʟs. Sɪɴᴄᴇ ᴛʜᴇ ɪᴏɴɪᴢᴀᴛɪᴏɴ ᴇɴᴛʜᴀʟᴘʏ ᴏғ ᴛʜᴇ ᴀʟᴋᴀʟɪɴᴇ ᴍᴇᴛᴀʟs ᴅᴇᴄʀᴇᴀsᴇs ᴡɪᴛʜ ᴛʜᴇ ɪɴᴄʀᴇᴀsᴇ ɪɴ ᴛʜᴇ sɪᴢᴇ ᴏғ ᴛʜᴇ ᴍᴇᴛᴀʟ ᴅᴏᴡɴ ᴛʜᴇ ɢʀᴏᴜᴘ. ... Tʜᴇʀᴇғᴏʀᴇ, ᴛʜᴇ ʀᴇᴀᴄᴛɪᴠɪᴛʏ ᴏғ ᴛʜᴇ ʜᴀʟᴏɢᴇɴ sᴇʀɪᴇs ᴅᴇᴄʀᴇᴀsᴇs ᴅᴏᴡɴ ᴛʜᴇ ɢʀᴏᴜᴘ.

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Answer 2

Answer:

Reactivity of the alkaline metals depends upon the ionization enthalpy of metals. ... Reactivity of the halogens depends upon the electron affinity of the halogens. Since the electron affinity of the halogens decreases down the group, due to the increase in the size of the halogen atoms.