Topic 1 history of the atom Flashcards
What did John dalton describe atoms as in the 19th century
Solid spheres that make up the different elements
What did Thomson conclude
Atoms weren’t solids
Must include electrons
Plum pudding model
Rutherford alpha particl scattering experiment results
Some straight back
some slightly deflected
some straight through
What does Rutherford call new item
Nuclear model
What did Rutherford conclude
Charged nucleus where mass is concentrated
Cloud of negative electrons surround nucleus
most of the atom and the space
What did Bohr conclude
Electrons in a cloud around the nucleus of an atom would be attracted to the nucleus causing the atom to collapse so he suggested that all electrons were contained in shells
What was the plum pudding model
A ball of positive charge with electrons embedded in it
What did Niels Bohr say
Electrons orbit the nucleus in fixed shells and aren’t anywhere in between
What further experiment did Rutherford do with protons
Showed that the nucleus could be divided into smaller particles which each have the same charge as a hydrogen nucleus these were called protons
What did James Chadwick’s experiment provide evidence for
Neutral particles in the nucleus which are called neutrons and resulted in a model of the atom which is close to the modern day excepted version
What order were the subatomic particles found in
Electron - JJ Thompson
Electron levels - Neil’s Bohr
Nucleus - Ernest Rutherford
proton - Ernest Rutherford
neutron - James Chadwick
