1.

Which is the first member of noble gas family?​

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ʀᴀᴅᴏɴ ᴡᴀs ғɪʀsᴛ ɪᴅᴇɴᴛɪғɪᴇᴅ ɪɴ 1900 ʙʏ ɢᴇʀᴍᴀɴ ᴄʜᴇᴍɪsᴛ ғʀɪᴇᴅʀɪᴄʜ ᴇ. ᴅᴏʀɴ; ɪᴛ ᴡᴀs ᴇsᴛᴀʙʟɪsʜᴇᴅ ᴀs ᴀ ᴍᴇᴍʙᴇʀ ᴏғ ᴛʜᴇ ɴᴏʙʟᴇ-ɢᴀs ɢʀᴏᴜᴘ ɪɴ 1904. ʀᴀʏʟᴇɪɢʜ ᴀɴᴅ ʀᴀᴍsᴀʏ ᴡᴏɴ ɴᴏʙᴇʟ ᴘʀɪᴢᴇs ɪɴ 1904 ғᴏʀ ᴛʜᴇɪʀ ᴡᴏʀᴋ



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