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Chemistry Unit 1.1: Atomic Structure
Definitions
Relative atomic mass - the mass of an atom relative to 1/12th the mass of a carbon-12 atom.

Relative isotopic mass - the mass of an isotope of an element relative to 1/12th the mass of a
carbon-12 atom.
Relative molecular mass - the…

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When electron subshells are "filling up" (i.e. electrons are being added to them), each orbital in that subshell
must have one electron before any orbital can take a second. Electrons fill shells in the following order:
1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p...
This can be…

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