1. Atomic Structure

2. Subatomic Particles ParticleSymbolChargeRelative mass location proton

3. Subatomic Particles ParticleSymbolChargeRelative mass location ProtonP+Positive + 1 AMUnucleus Neutron

4. Subatomic Particles ParticleSymbolChargeRelative mass location ProtonP+Positive + 1 AMUnucleus Neutron NNeutral1 AMUnucleus

5. Subatomic Particles ParticleSymbolChargeRelative mass location ProtonP+Positive + 1 AMUnucleus Neutron NNeutral1 AMUnucleus Electron

6. Subatomic Particles ParticleSymbolChargeRelative mass location Proton P+Positive + 1 AMUnucleus Neutron NNeutral1 AMUnucleus Electron e-Negative - 1/2000 AMU Outside nucleus

7. What do atoms look like?

8. Atom structure

9. Atomic Number The number of PROTONS in the nucleus. Atomic Number = _____________

10. Atomic number This determines the PROPERTIES of an element. Carbon is carbon because it has 6 protons or an atomic number of ______.

11. Elements of the periodic table go in order of increasing ATOMIC NUMBER.

12. Mass Number Proton mass= ________ Neutron mass= _______ Electron mass= _______ Mass Number = number of PROTONS+ number of NEUTRONS.

13. Writing an element name and symbol Carbon-14 (Element name)– (Mass number) ________ 14 C ________ 6 ________

14. On the periodic table, info looks like this: 6 C Carbon 12.0107

15. Tips for analyzing an atom How do you know how many protons an atom has? Look for the ATOMIC NUMBER on the PERIODIC TABLE.

16. How to know the number of electrons Neutral atoms have the same number of PROTONS (+) and ELECTRONS (-)

17. How to find the number of neutrons Find your MASS NUMBER Find the number of PROTONS Mass # - # Protons= # Neutrons

18. Practice 8 O Oxygen 15.999