P4 Flashcards
What is the order for the discovery of sub atomic particles?
EPN
How did John dalton describe atoms?
Solid spheres
The smallest possible unit
Different sizes for different elements
What is the radius of an atom?
1*10-10
What did JJ Thompson do?
Plum pudding model and discovered electrons
What did Rutherford do?
Scattered alpha particles at a leaf of gold foil 1909
What happened to the alpha particles in Rutherford experiment?
Some were:
Went through
Deflected
Reflected
What was Rutherford conclusion?
There was more mass in the nucleus and a cloud of negative charge around
What did Bohr suggest?
Electrons orbit the nucleus at fixed distances in shells
What is the model we use today?
The nuclear model
What was the order of the development of the atom?
Democritus
Dalton
Thompson
Rutherford
Bohr
Rutherford (protons)
Chadwick
How do you do an alpha equation?
Decrease mass number by 4
Decrease atomic number by 2
How do you do a beta equation?
+1 in atomic number
How do you do an equation for gamma?
No change
How do you do a neutron emission equation?
-1 from mass number
