1. The Atom

2. What do you know? Part of AtomLocationMasscharge

3. How many of each “part” are in these atoms? Fluorine (F) atomic number = 9 & atomic mass = 19 Copper (Cu) atomic number = 29 & mass = 64

4. Copy this table Part of atomLocationMassCharge ProtonNucleus1Amu+1 NeutronNucleus1Amu0 (neutral) ElectronElectron “Cloud”0 Amu Amu = “Atomic Mass Unit” (not grams)

5. How many of each “part” are in these atoms? Fluorine (F) atomic number = 9 & atomic mass = 19 Copper (Cu) atomic number = 29 & mass = 64

6. Structure of the Atom Atomic number = number of protons in the nucleus AND number of electrons outside it Atomic mass = total mass of the protons + the neutrons. It is always a whole number. The number of neutrons = atomic mass – the number of protons.

7. Answers Fluorine atomic mass = 19 and atomic number is 9 Has 9 protons (+) and 9 electrons (-) Has 19 - 9 = 10 neutrons Copper atomic mass = 64 and number = 29 Has 29 protons (+) and 29 electrons (-) Has 64 – 29 = 35 neutrons

8. Mass of electron How can anything have no mass – So small compared to the rest of the atom it does not count For example – if I pluck one hair out of my head – my mass on my bathroom scale will not change. The hair has mass, but it is so insignificant compared to the rest of me, we call it 0.

9. Atom locations Nucleus (+) __ Electron Cloud (-)

10. Nucleus Nucleus is (+) + + + - - - - Neutron Proton

11. Electron shells Electrons are outside the nucleus in an “electron cloud” made of energy levels

13. Number Element Symbol Atomic MassAtomic Number Protons Neutrons Electrons 1 C 2 Oxygen 3 7 4 26.98 5 P 6 Magnesium 7 Mn 8 35.45 9 11 10 30 11 126.9 12 Fe 13 Sulfur 14 20 15 19

14. Number Element Symbol Atomic Mass Atomic Number Protons Neutrons Electrons 1. Sodium Na 2. Potassium 19 3. 26.98 4. P

15. Isotope Notation Isotope Notation shows the symbol of the element with the atomic mass and atomic number on the left, atomic mass above. Atomic Mass 25 Symbol Mg Atomic Number 12

16. Atomic Structure using Isotope Notation Atomic Mass 25 Symbol Mg Atomic Number 12 Number of protons = Atomic Number = 12 Number of electrons = number of protons (12) Number of neutrons = Atomic Mass – Atomic Number = 25 – 12 = 13

17. Practice 35 37 Cl Cl 17 17 Protons = 1717 Electrons = 1717 Neutrons = 1820