The atom

• What is the equation to find the Ar of isotopes?

  Ar = isotope 1(abundance x mass) + isotope 2(abundance x mass) / 100
• What was the first idea about the atom?

  Tiny spheres of positive charge
• What was J.J Thompson's idea about the atom?

  A ball of positive charge with negative electrons embedded
• What was Rutherford's experiment?

  Alpha particle scattering experiment
• What did Rutherford's model suggest?

  • Nuclear model
  • The atom is mostly empty space
• What was Neils Bohr idea about the atom?

  Electrons orbit the nucleus at specific distances
• What did James Chadwick discover about the atom?

  The neutron was also in the nucleus