Turn on thread page Beta
    • Thread Starter
    Offline

    1
    ReputationRep:
    I understand how Rutherford's gold foil experiment proved that a positive nucleus existed, but I don't get why prior to this discovery they expected all of the alpha particles to pass straight through. The plum pudding model said there was electrons in a sea of positive charge, so wouldn't they expect all alpha particles to be repelled backwards as like charges repel and the alpha particles were positively charged??? Why would they expect them to pass through if they didn't know the atom was mostly empty space??? Thanks for any help!
    Offline

    12
    ReputationRep:
    (Original post by mayjb)
    I understand how Rutherford's gold foil experiment proved that a positive nucleus existed, but I don't get why prior to this discovery they expected all of the alpha particles to pass straight through. The plum pudding model said there was electrons in a sea of positive charge, so wouldn't they expect all alpha particles to be repelled backwards as like charges repel and the alpha particles were positively charged??? Why would they expect them to pass through if they didn't know the atom was mostly empty space??? Thanks for any help!
    I thought that the fact that they passed through was unexpected? Or maybe Rutherford's theory was something about empty space, and this proved it? I'm not really sure, sorry.

    Posted from TSR Mobile
    Offline

    20
    ReputationRep:
    I believe it is the fact that only some were repelled showed that most of the atom is empty space.
    • Thread Starter
    Offline

    1
    ReputationRep:
    (Original post by Science_Girl)
    I thought that the fact that they passed through was unexpected? Or maybe Rutherford's theory was something about empty space, and this proved it? I'm not really sure, sorry.

    Posted from TSR Mobile
    thanks for the help anyway
    • Thread Starter
    Offline

    1
    ReputationRep:
    (Original post by Bobjim12)
    I believe it is the fact that only some were repelled showed that most of the atom is empty space.
    ok thanks!
    • Aston Villa FC Supporter
    Offline

    3
    ReputationRep:
    Aston Villa FC Supporter
    If the plum pudding model was correct, then the charge would be evenly spread, so no reflection would occur. When some of the alpha particles bounced back, Rutherford described it as 'it was as shocking as if you fired a 15 inch naval shell at tissue paper and it bounced back'.
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: March 26, 2016

2,947

students online now

800,000+

Exam discussions

Find your exam discussion here

Poll
Should predicted grades be removed from the uni application process

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.