Atomic Theories And Models Flashcards
What did Democritus state about the atom model and when
In 400BC
The atom was what makes things with empty space.
What did Dolton do and when
In 1800
Created the billiard ball model
What did JJ Thompson do and when
1897
Created the plum pudding model
Describe the plum pudding model
Negatively charged electrons embedded in a sphere of positive charge.
What did Neils Bohr conclude
That electrons orbit the nucleus at specific distances
What did James Chadwick do
Discover the electron
What did the gold foil experiment discover
It discovered that the atom had a small positive nucleus with electrons around it. It had mostly empty spaces
What were the results of the experiments In terms of how the particles moved
Most particles go right through the foil. Some particles are deflected through angles
Some bounce back directly
What is a molecule
2 or more atoms chemically joined
What are compounds
Umpire molecules
What is an ionic compound
One that contains both metallic and non metallic elements combined
What is a covalent compound
A compound that contains only non metallic elements
What is mixture
A substance that is impure and not chemically joined
What is the substance called that does the dissolving
Solvent
What is the substance that dissolves called
The solute
