Atoms and Isotopes
Proton: Relative mass: 1 Relative charge: +1
Neutron: Relative mass: 1 Relative charge: 0
Electron: Relative mass: 1/1840 Relative charge: -1
Atomic Number: number of protons in the nucleus of the atom.
Mass Number: total number of protons and neutrons in nucleus of an atom.
Number of Neutrons: mass number - atomic number.
Number of Electrons: number of protons.
Isotopes: atoms of the same element with different mass numbers. Properties: same chemical properties, different physical properties, different rates of diffusion, radioactivity. Different numbers of neutrons but the same number of protons.
- Known as Orbitals
- A orbital can hold upto two electrons
- Each sub-shell has different orbitals s, p, d,f
- Electrons have a property called "spin"
- Each electron is often shown with an arrow