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Shells, sub-shells and orbitals

Shells, sub-shells and orbitals

Flowchart of electron sub-shell filling sequence up to 4p, showing 1s to 4p with capacities and note that 4s fills before 3d The atomic number, ZZZ, tells you how many protons an atom has. In a neutral atom, the number of electrons is also ZZZ, so sodium has 11 electrons and bromine has 35.

Electron configuration Lesson

  1. A Level
  2. /Chemistry
  3. /Electron configuration