Who thought that atoms were tiny, solid spheres with no smaller particles within them. and also predicted that atoms could not be destroyed?

• Democritus

• Aristotle

• Plato

• Thomson

Who proposed atomic theory in 1808?

• Democritus

• Jon Dalton

• Ernest Rutherford

• J J Thomson

Tags

NGSS.HS-PS1-7

The main ideas of Dalton's theory were:

1. All matter is composed of ------------ atoms.

2. All the atoms of a given element are ---------.

Tags

NGSS.MS-PS1-5

Name the first person to propose the idea of atoms.

• Socrates

• Plato

• Democritus

• Aristotle

Specify which of these is one of the main ideas behind Democritus' model of the atom.

• Atoms are tiny

• Atoms are composed of subatomic particles

• Negatively charged particles exist within atoms

• Atoms are mostley empty spaces

Democritus proposed his idea of atoms around 460 BC

. what was the main reason why his idea of atoms was dismissed when he proposed it?

• Atoms are very tiny to be seen so that there was no evidence they existed.

• The Greeks were preoccupied with fighting to pay attention to Democritus

• Democritus did not publish his findings in an official scientific textbook.

In 1808, John Dalton proposed his atomic theory. Recall which of the following statements is one of the main ideas of Dalton's atomic theory.

• Atoms are solid spheres

• All matter is composed of indivisible atoms

• Atoms are made up of smaller charged particles

Tags

NGSS.HS-PS1-7

Who carried out a cathode ray experimentand discovered Electrons in 1897?

• J. J. Thomson

• Ernest Rutherford

• John Dalton

• Chadwick

Who proposed a model of the atom that is now called the plum pudding model?

• J J Thomson

• Ernest Rutherford

• James Chadwick

• John Dalton

Tags

NGSS.MS-PS1-1

Who discovered Protons when he carried out a gold foil experiment in 1911?

• Ernest Rutherford

• James Chadwick

• Neil Bohr

• Erwin Schrudinger