4.3 Modern Atomic Theory

1. 4.3 Modern Atomic Theory What can happen when an atom absorbs energy? - an increase in kinetic energy or a phase change energy may be absorbed by an atom, then emitted as light

2. 4.3 Modern Atomic Theory Niels Bohr (1885-1962) agreed with Rutherford’s model but added something to it energy levels – the possible energies that electrons in an atom can have

3. 4.3 Modern Atomic Theory when it loses the energy it emits it as light when an atom gains energy an electron may move to a higher energy level no two elements have the same set of energy levels, so the emit different colors of light

4. 4.3 Modern Atomic Theory Electron Cloud Model electron cloud model – model of the most likely locations for electrons in an atom (deals with probability)

5. 4.3 Modern Atomic Theory Electron Cloud Model of a Hydrogen Atom

6. 4.3 Modern Atomic Theory

7. 4.3 Modern Atomic Theory orbital – region of space where an electron is likely to be found

8. 4.3 Modern Atomic Theory electron cloud – a good approximation of how electrons behave in their orbitals

9. 4.3 Modern Atomic Theory atoms emit light when their electrons return to ground state electron configuration – arrangement of electrons in the orbital of an atom ground state – electrons are all in their lowest possible energy levels (most stable) excited state – one or more electrons are in a higher energy level than usual (least stable)

10. Chapter 4 Vocabulary isotopes proton nucleus mass number electron configuration energy levels atomic number neutron orbital electron cloud electron ground state excited state

11. Chapter 4 Vocabulary isotopes proton nucleus mass number energy levels atomic number neutron orbital electron cloud electron ground state excited state

12. Chapter 4 Vocabulary isotopes proton mass number energy levels atomic number neutron orbital electron cloud electron ground state excited state

13. Chapter 4 Vocabulary isotopes proton mass number energy levels atomic number orbital electron cloud electron ground state excited state

14. Chapter 4 Vocabulary isotopes proton mass number energy levels atomic number electron cloud electron ground state excited state

15. Chapter 4 Vocabulary isotopes proton mass number energy levels atomic number electron cloud electron ground state

16. Chapter 4 Vocabulary isotopes proton mass number energy levels electron cloud electron ground state

17. Chapter 4 Vocabulary proton mass number energy levels electron cloud electron ground state

18. Chapter 4 Vocabulary proton mass number electron cloud electron ground state

19. Chapter 4 Vocabulary proton electron cloud electron ground state

20. Chapter 4 Vocabulary proton electron ground state

21. Chapter 4 Vocabulary proton electron

22. Chapter 4 Vocabulary proton

23. Chapter 4 Vocabulary