Zusammenfassung der Ressource
Atomic Structure
- sub-atomic particle
- protons
- +ve charge
- 1 unit
- neutrons
- no charge
- 1 unit
- electrons
- -ve charge
- 1/1840 units
- Nucleus
- atomic Number
- the No' of P+
- Mass Number
- No' of P+ plus Neuts
- Atomic Shells
- 1st shell max 2e-s
- 2nd & 3rd shells max 8e-s
- Valency
- Grp No' = No' of e-s in the outer shell
- Grp I = 1e-s in outer shell
- Grp 2 = 2 e-s in outer shell
- elements with a full shell of e-s are stable
- Noble gases Grp VIII
- History
- Thomson -solid sphere model
- Rutherford Plum pudding model