1. Atomic Structure
I. Subatomic Particles
C. Johannesson

2. ? WHATS IN AN ATOM? THREE MAIN PARTICLES PROTONS NEUTRONS ELECTRONS
C. Johannesson

3. C. Johannesson

4. Subatomic Particles equal in a neutral atom Atomic Number
NUCLEUS
Electron Cloud
PROTONS
NEUTRONS
Electrons
equal in a neutral atom
QUARKS
Atomic Number
equals the # of...
POSITIVE CHARGE
NEUTRAL CHARGE
Most of the atom’s mass.
C. Johannesson

5. HOW DO MASSES COMPARE ?
MEASURED IN AMU’s. (this stands for atomic mass units)
1 AMU = the mass of 1 proton or 1 neutron
Proton = 1 amu, or x grams
Neutron = 1 amu or x grams
Electrons = 0 amu or 9.11 x grams
Comparatively, electrons have 1/1836 the mass of either the proton or neutron

6. Subatomic Particles Quarks component of protons & neutrons 6 typesHe
3 quarks = 1 proton or 1 neutron
C. Johannesson