Give scientific reason sodium is more metallic than aluminium
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ᴛʜᴇ ᴇғғᴇᴄᴛɪᴠᴇ ɴᴜᴄʟᴇᴀʀ ᴄʜᴀʀɢᴇ ɪs ᴍᴏʀᴇ ᴏɴ ᴀʟᴜᴍɪɴɪᴜᴍ ᴛʜᴀɴ sᴏᴅɪᴜᴍ ᴀɴᴅ ᴛʜᴜs ᴀʟᴜᴍɪɴɪᴜᴍ ʜᴀs ᴀ sᴍᴀʟʟᴇʀ sɪᴢᴇ. ᴛʜᴜs, ʀᴇᴍᴏᴠᴀʟ ᴏғ ᴇʟᴇᴄᴛʀᴏɴs ғʀᴏᴍ ᴀʟᴜᴍɪɴɪᴜᴍ ʀᴇǫᴜɪʀᴇs ʜɪɢʜᴇʀ ᴇɴᴇʀɢʏ ᴛʜᴀɴ sᴏᴅɪᴜᴍ ɪ.ᴇ. ɪᴏɴɪᴢᴀᴛɪᴏɴ ᴇɴᴇʀɢʏ ᴏғ ᴀʟᴜᴍɪɴɪᴜᴍ ɪs ʜɪɢʜᴇʀ ᴛʜᴀɴ sᴏᴅɪᴜᴍ. ᴛʜɪs ᴍᴀᴋᴇs sᴏᴅɪᴜᴍ ᴍᴏʀᴇ ᴍᴇᴛᴀʟʟɪᴄ ᴛʜᴀɴ ᴀʟᴜᴍɪɴɪᴜᴍ.
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The effective nuclear charge is more on aluminium than sodium and thus aluminium has a smaller size. Thus, removal of electrons from aluminium requires higher energy than sodium i.e. ionization energy of aluminium is higher than sodium. This makes sodium more metallic than aluminium.
Explanation:
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