Year 8 - Materials, their structure and properties

Whose model suggested that negative particles were mixed in with positively charged material - like seeds in a watermelon?

• J. J. Thomson

• Ernest Rutherford

• Niels Bohr

• Democritus

Who discovered that the atom had a small, dense, positively charged center?

• Ernest Rutherford

• Democritus

• John Dalton

• J. J. Thomson

Place the following atomic models in order, from earliest to latest:

A) Rutherford

B) Thomson

C) Bohr

• B - C - A

• A - B - C

• B - A - C

• C - B - A

what can you conclude from the fact that scientists continue to update the atomic model?

• Scientists still have no idea what atoms look like

• Scientists did not have any information about atoms until a few years ago

• Old information about atoms is completely useless.

• New information about atoms continue to be discovered.

Which scientist believed an atom was indivisible?

• Democritus

• Bohr

• Thomson

• Chadwick

In the atomic model nicknamed the "plum pudding"model, what do the plums represent?

• nucleus

• atom

• electrons

• positive material

Who discovered that atoms are mostly empty space?

• Bohr

• Thomson

• Rutherford

• Chadwick

Who proposed that electrons move around the nucleus in circular orbits?

• Democritus

• Thomson

• Rutherford

• Bohr

In the nucleus you can find ...

• protons, neutrons and electrons

• protons and neutrons

• protons and electrons

• neutrons

An element has an atomic number of 9 and an atomic mass of 19. What is the number of protons this element has?

• 9

• 19

• 10

• 28