Atoms and radiation Flashcards
mass of a proton
1
mass of a neutron
1
mass of an electron
very small, practically 0
What is radiation
Anything coming from the nucleus
What are the 3 forms of radiation
Alpha, Beta and Gamma
How is radiation measured
Geiger counter
What was found from the Rutherford experiment
1/ Most of the atom is empty space
2/ There is a positive center to the atom
3/ The positive center is very dense
How do they know most of the atom is empty space
Most alpha particles passed straight through the gold foil
How do they know There is a positive center to the atom
Some alpha particles passed through but were deflected by varying amounts
How do they know That the positive center is very dense
Very few came straight back
What are two examples of radioactive elements
Uranium & Plutonium
Alpha radiation is composed of what
a helium nucleus
What is beta radiation
Electron fired from the nucleus
What is gamma radiation
Electromagnetic wave
What is the range of an alpha particle
Few cms