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- Wed Jan 16, 2019 3:15 pm
- Forum: Biology
- Topic: Biology $\bigcap$ Mathematics
- Replies: 18
- Views: 12253
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1st Q.-because 2 electrons, which have gone are the last electrons. 3d8 4s1 or 3d7 4s2 is not needed to make Cu2+ stable. These are containing an extra orbit. 3d9 in enough.