P1.1

Question 1

What is matter made of?

Answer 1

Atoms

Question 2

What is the radius of an atom?

Answer 2

1x10^-10 m (0.1 nm)

Question 3

Where is most of the mass of an atom?

Answer 3

In the nucleus

Question 4

What can an electric charge cause?

Answer 4

Forces between atoms, which holds the atoms together to make solids and liquids

Question 5

What are molecules?

Answer 5

Some atoms can form groups held together by electric force. These are called molecules. 

Question 6

John Dalton

Answer 6

He discovered atoms are elements they are basic spheres, and attach to make compounds

Question 7

J.J.Thompson

Answer 7

-Discovered the electron (a negatively charged particle)
-Created the plum pudding model
-Knew that the overall charge of an atom is neutral 

Question 8

Ernest Rutherford

Answer 8

-Discovered alpha particles
-Fired particles at thin sheets of gold and found that some particles bounced back (alpha scattering)
-Concluded there are protons and neutrons in the nucleus

Question 9

Niels Bohr

Answer 9

Improved Ernests nuclear model by describing the pathways of electrons in orbit around the nucleus