Atomic Theory

Question 1

Isotopes and properties

Answer 1

• Atoms with same atomic number but different mass number (ie different number of neutrons)
• Isotopes may differ in physical properties (mass, density, rate of diffusion etc.) and radioactivity but not generally in chemical properties.

Question 2

Atomic and mass number

Answer 2

Atomic: number of protons
Mass: number or protons and neutrons

Question 3

Relative atomic mass

Answer 3

• The average of the atomic masses of each isotope multiplies by the isotope’s relative abundance. This results in non-integral atomic masses.
  -((%abundancemass1)+(%abundancemass2))/overall %abundances