Quiz 2.1 - Our changing picture of the atom

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This quiz has 5 questions. Click Submit at the end to mark it. No personal data is collected.

Here is an image of what Dalton's model of an atom would look like if you could cut it in half - which Dalton said you couldn't.

Use this image to answer questions 1 - 2.

1. True or False? Dalton thought that atoms were as small as you could get. *

1 point

True

False

2. True or False? Atoms were the same all the way through. *

1 point

True

False

3. The 'Crookes Railway' was an important piece of evidence that there might be something smaller than an atom.

Could scientists really see little particles coming out of the negative terminal?

1 point

Yes - they were visible with the naked eye

Yes - but only with a powerful microscope

No - they had to guess they were particles, because they couldn't explain what else could make the wheel move

4. JJ Thomson's experiment suggested that there existed negatively charged particles that were much, much smaller than atoms.

Why was this such an important discovery?

1 point

It proved the existence of the atomic nucleus

It ultimately led to the conclusion that atoms were made of smaller parts

It showed that a nuclear reactor would work in theory

5. JJ Thomson imagined that an atom was made from a 'pudding' of positively charged material with 'plums' of tiny negatively charged particles embedded in it.

Which of these statement are true about Thomson's plum pudding model? Choose three.

1 point

The atom overall was neutral

This is the model of the atom that we use today

The negative 'plums' came to be known as electrons

The model seems strange to us, but very clever people at the time had good reasons for believing it was possible

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