ATOMIC STRUCTURE
Subatomic particles
● Nucleus = protons + neutrons
● Electrons exist on energy levels
Particle Charge Mass
Proton +1 1
Neutron 0 1
Electron -1 5x10-4
Notation
● A = Total number of protons + neutrons in nucleus
● Z = Total number of protons (also = total number of electrons)
Isotopes
● Elements of the same kind with the number number of protons (and
electrons) but different number of neutrons
● Different atomic mass
● Same chemical properties
- Chemical properties depend on the electron configuration
● Different physical properties
Subatomic particles
● Nucleus = protons + neutrons
● Electrons exist on energy levels
Particle Charge Mass
Proton +1 1
Neutron 0 1
Electron -1 5x10-4
Notation
● A = Total number of protons + neutrons in nucleus
● Z = Total number of protons (also = total number of electrons)
Isotopes
● Elements of the same kind with the number number of protons (and
electrons) but different number of neutrons
● Different atomic mass
● Same chemical properties
- Chemical properties depend on the electron configuration
● Different physical properties
