history of the atom

• what are the scientists names that stand for this acronym- Don’t Try and Remember Brilliant Chemists


  john Dalton, jj Thomson, ernest Rutherford, niels Bohr, james Chadwick
• what did john dalton describe the atomic theory as?

  billard ball-solid spheres, different spheres made up different elements (19th century)
• what did jj thomson say atomic structure was?

  plum pudding model-negative electrons spread in positively charged materials(1897)
• what did ernest rutherford say the atomic structure was?

  nucleur model-small positively charged nucleus surrounded by empty space and a layer of electrons to form the outside of the atom(1909)
• what experiment did rutherford use to come up with the nuclear model?

  he fired positively charged alpha particles at extremely thin sheet of gold, most went straight through, more than expected(if plum pudding had been correct)were deflected by the nucleus when fired directly at it
• what did niels bohr say the atomic structure was?

  bohr model-electrons orbit around the nucleus in fixed shells that have a fixed distance from the nucleus(this idea was supported by experiments)
• what did james chadwick sat the atomic structure was?

  nucleur model-discovered the neutron