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:

  1. maia duchnowska10 November 2014 at 04:00

    thanks was dying of stresssss !!!

    ReplyDelete
  2. Mike Tsang10 July 2017 at 03:08

    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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