C1 The Atom

Question 1

What does the alpha scattering experiment prove

Answer 1

The existence of the nucleus

Question 2

Who discovered the neutron

Answer 2

James Chadwick

Question 3

Describe the plum pudding model

Answer 3

Larger circle of positive charge filled with electrons (smaller circles of negative charge)

Question 4

What happened in the alpha scattering experiment

Answer 4

Alpha particles were fired at a layer of gold foil, some of the alpha particles were reflected backwards however some went through the foil. This proves the existence of the nucleus.

Question 5

Describe the model after the plum pudding model

Answer 5

Nuclear model - electrons orbit a nucleus but not at set distances

Question 6

Describe the Electron shell (Bohr) model

Answer 6

Electrons must orbit nucleus at fixed distances called shells.

Question 7

Calculation for relative atomic mass in terms of isotopes

Answer 7

(Abundance of isotope 1 x Mass of isotope 1) + (Abundance of isotope 2 x Mass of isotope 2)

All divided by 100