3. Quantum Model of Atom

4. Energy levels (shells) are divided into sublevels (subshells).
Electrons are found in orbitals in these sublevels.

5. ORBITALS - SUBLEVELS

6. Orbital – the three dimensional area around the nucleus where a particular electron can be found. Each orbital can hold two electrons

7. Principle Quantum Number
TELLS YOU WHAT SHELL AN ORBITAL IS IN
n=6
n=5
n=4
n=3
Energy
n=2
n = 1
V.Montgomery & R.Smith

8. Each shell (level) has sublevels. Different types of sublevels: s,p,d,f

9. s orbital
One s orbital per shell

10. p orbitals
Three p orbitals per shell starting with 2nd shell.

11. p orbitals first appear in the 2nd shell

12. Five d orbitals per shell starting with 3rd shell

13. d orbitals 1st appear in the 3rd shell

15. Aufbau Principle – electrons fill the lowest energy orbitals first.

16. Sublevel filling order: