Wednesday, 13 February 2013

1.9 understand that atoms consist of a central nucleus, composed of protons and neutrons, surrounded by electrons, orbiting in shells



The protons and neutrons in the centre make up the nucleus
The electrons are orbiting on shells (or orbitals)
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4 comments:

  2. The Chemistry Syllabus has changed…

    Here is a New blog for the 2017 Syllabus:

    https://igcse-chemistry-2017.blogspot.hk/

    ReplyDelete

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