explain why electron affinity of certain elements is positive while others have negative
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The amount of energy released when an electron is added to a neutral atom to form an anion. ... So the more negative the electron affinity the more favourable the electron addition process is. Not all elements form stable negative ions in which case the electron affinity is zero or even positive
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❥ ᴛʜᴇ ᴀᴍᴏᴜɴᴛ ᴏғ ᴇɴᴇʀɢʏ ʀᴇʟᴇᴀsᴇᴅ ᴡʜᴇɴ ᴀɴ ᴇʟᴇᴄᴛʀᴏɴ ɪs ᴀᴅᴅᴇᴅ ᴛᴏ ᴀ ɴᴇᴜᴛʀᴀʟ ᴀᴛᴏᴍ ᴛᴏ ғᴏʀᴍ ᴀɴ ᴀɴɪᴏɴ.sᴏ ᴛʜᴇ ᴍᴏʀᴇ ɴᴇɢᴀᴛɪᴠᴇ ᴛʜᴇᴇʟᴇᴄᴛʀᴏɴ ᴀғғɪɴɪᴛʏ ᴛʜᴇ ᴍᴏʀᴇ ғᴀᴠᴏᴜʀᴀʙʟᴇ ᴛʜᴇ ᴇʟᴇᴄᴛʀᴏɴ ᴀᴅᴅɪᴛɪᴏɴ ᴘʀᴏᴄᴇss ɪs. ɴᴏᴛ ᴀʟʟ ᴇʟᴇᴍᴇɴᴛsғᴏʀᴍ sᴛᴀʙʟᴇ ɴᴇɢᴀᴛɪᴠᴇ ɪᴏɴs ɪɴ ᴡʜɪᴄʜ ᴄᴀsᴇ ᴛʜᴇ ᴇʟᴇᴄᴛʀᴏɴ ᴀғғɪɴɪᴛʏɪs ᴢᴇʀᴏ ᴏʀ ᴇᴠᴇɴ ᴘᴏsɪᴛɪᴠᴇ.
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