Electron Configurations --- An Introduction

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Learn how to write out the electron configuration of elements.

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Hello!This really helped, even if it's not in my native language.I have two questions though:which grade is this suitable for?I'm trying to see if my school system is that bad, since I'm learning this in 8th grade.And also, what about Cr and Cu?I think they're exceptions but i don't know how..Thank you!

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