Write the electronic configuration of 24Cr and 29Cu.
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ᴛʜᴇsᴇ ᴇʟᴇᴄᴛʀᴏɴɪᴄ ᴄᴏɴғɪɢᴜʀᴀᴛɪᴏɴs ᴀʀᴇ ᴜɴɪǫᴜᴇ sɪɴᴄᴇ ᴡɪᴛʜᴏᴜᴛ ғɪʟʟɪɴɢ ᴛʜᴇ s ᴏʀʙɪᴛᴀʟs ᴄᴏᴍᴘʟᴇᴛᴇʟʏ, ᴇʟᴇᴄᴛʀᴏɴs ᴇɴᴛᴇʀᴇᴅ ɪɴᴛᴏ -ᴅ ᴏʀʙɪᴛᴀʟs.
ʀᴇᴀsᴏɴ :-
ɪᴛ ʜᴀs ʙᴇᴇɴ sᴀɪᴅ ᴛʜᴀᴛ ᴡʜᴇɴᴇᴠᴇʀ ᴅ ᴏʀʙɪᴛᴀʟ ɪs ʜᴀʟғ ғɪʟʟᴇᴅ ᴏʀ ᴄᴏᴍᴘʟᴇᴛᴇʟʏ ғɪʟʟᴇᴅ ɪᴛ ɪs sᴛᴀʙʟᴇ. ᴛʜᴜs, ᴇʟᴇᴄᴛʀᴏɴs ʜɪᴛ ɴᴇᴀʀʟʏ ʜᴀʟғ ғɪʟʟᴇᴅ ᴀɴᴅ ᴄᴏᴍᴘʟᴇᴛᴇ ғɪʟʟᴇᴅ ɪɴ ᴛʜᴇ ɢɪᴠᴇɴ ɪɴsᴛᴀɴᴄᴇ, sᴏ ᴏɴᴇ ᴇʟᴇᴄᴛʀᴏɴ ᴀʀʀɪᴠᴇᴅ ғʀᴏᴍ ᴛʜᴇ s ᴏʀʙɪᴛᴀʟs ɪɴ ᴛʜᴇ ᴅ ᴏʀʙɪᴛᴀʟs ᴅᴜᴇ ᴛᴏ ᴛʜᴇ ᴀᴛᴛʀᴀᴄᴛɪᴏɴ.
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Cu = 29 = 1s² 2s² 2p⁶ 3s² 4p⁶ 4s¹ 3d¹⁰ These electronic configuration are exceptional because electrons entered in 3-d orbitals without filling the 4s orbitals complete.
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