Development of the Atom

The Greeks thought matter was made up of sphere called atoms that could not be split into anything smaller

• True

• False

Tick all the correct answers: John Dalton thought that atoms

• have different masses

• could not be split into anything smaller

• could be split into anything smaller

• all have the same mass

Which Scientist discovered the existence of electrons?

• Chadwick

• John Dalton

• JJ Thomson

• Rutherford

• Borh

Electrons have a ___________ charge

• positive

• negative

• no

An electron will be _________________ to a positively charged plate and would move ______________ it.

• attracted & towards

• repelled & away from

In the 'plum-pudding' model the electrons and found

• at the bottom of the ball of positive charge

• spread out through out the ball of negative charge

• spread out through out the ball of positive charge

• all together in the middle

Which scientist discovered the atom has a small central positive nucleus with negative electrons orbiting it?

• Bohr

• Chadwick

• Dalton

• JJ Thomson

• Rutherford

Rutherford fired alpha particles at a very thin piece of ________ foil.

• plastic

• silver

• gold

• carbon

Bohr discovered that the _________________ are at fixed distances from the nucleus.

• protons

• neutrons

• energy shells

Which Scientist discovered the existence of neutrons?

• Bohr

• Chadwick

• Rutherford

• JJ Thompson