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Chemistry- Atomic Structure

Electron Shells

• Electrons have fixed energies
• Move around in shells/energy levels
• Each shell given a number, the principal quantum number.
• The further a shell is from the nucleus, the higher it's energy and the higher it's principal quantum number.
• Shells are divided into sub shells
• Different electron shells have a different number of sub-shells, each have a different energy.
• Sub-shells can be s Sub shells, p Sub shells, d Sub shells or f Sub shells
• 1s
• 2s,2p
• 3s, 3p,3d
• 4s, 4p, 4d, 4f
• An orbital can hold 2 electrons