please can someone explain to me the evidence for a nuclear atom :(

  • 0 votes

something to do with the Rutherford- Geiger-Marsden experiment

Posted Sun 5th June, 2011 @ 19:23 by amy

2 Answers

  • 1 vote

Alpha particles were fired at thin gold foil. Most went straight through proving that most of the atom was empty space. The others were deflected slightly, a few were deflected back along the same line. As alphas are positively charged, this showed that there is a small area of strong positive charge within the atom as like charges repel, this area is now known as the nucleus.

Hope this is of some help :)

Answered Sun 5th June, 2011 @ 21:51 by Oliver
  • 0 votes

the alpha particles were  fired at gold foil        

                       l

0 0     0      0    l     0    --> some went straight through which proved that there is a lot of

                       l                 empty space in an atom

          <--  0     l

some were refected back to the source which proved that there was a positive core (nucleus) in the atom that was positive (as positive alpha particles repel positive gold nuclei)

however some were deflected off at angle angle but stll carried on through

                           l

0            0   -->    l

                           l    0 (deflected particle) -->          this proved that there were negatively charged electrons on the outer part of the atom because the positive alpha particles had been attracted to the negative electrons

hope that helps :)

sorry if the diagram is complicated, this one's probably better:

http://www.sr.bham.ac.uk/xmm/images/atom/rutherford_4k_192_225.gif

good luck tomorrow!!

Answered Mon 6th June, 2011 @ 20:13 by Lucy