Lesson 1 - Studying Atoms
Terms in this set (8)
What theory did Dalton propose about the structure of matter?
All matter is composed of individual particles called atoms, which cannot be divided.
What evidence did J.J. Thomson provide about the structure of an atom?
Thomson provided the first evidence that atoms are made from even smaller particles.
What did Rutherford discover about the structure of an atom?
All of the positive charge of an atom is concentrated in its nucleus.
What evidence did Thomson have that his glowing beam contained negative particles?
The beam was attracted to a positively charged plate and repelled by the negatively charged plate.
Why was Dalton's model changed after Thomson's experiment?
Dalton assumed atoms were solid invisible particles. Thomson had evidence that smaller particles existed inside atoms.
Why did scientists accept Dalton's atomic theory but not the idea of an atom by the Greek philosophers?
Dalton had data from experiments to supply his theory whereas the Greeks DID NOT.
If you saw a beam of particles being bent towards a negatively charged plate, what would you conclude?
The particles did not have a positive charge.
In the Rutherford experiment, why weren't all the alpha particles deflected?
The nucleus is small compared with the atom as a whole. Very few of the alpha particles came close enough to a gold nucleus to be deflected.
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THIS SET IS OFTEN IN FOLDERS WITH...
Lesson 2 - Structure Of An Atom
Lesson 3 - Modern Atomic Theory