Atomic Theory

Front

Who was the first person to propose a theory about an atom?

Back

Democritus

Front

What scientist first developed 4 rules for atomic theory and helped kick start modern chemistry?

Back

John Dalton

Front

What particle is found in the nucleus and has no charge?

Back

Neutron

Front

Who is best known for the 'Plum Pudding' model of the atom?

Back

J.J. Thomson

Front

What did Niels Bohr suggest about electrons?

Back

Electrons are found in specific orbits.

Front

What is the basic unit of matter?

Back

Atom

Front

What are the three main subatomic particles?

Back

Protons, Neutrons, Electrons

Front

What charge does a proton have?

Back

Positive charge

Front

What charge does an electron have?

Back

Negative charge

Front

What is the mass of a neutron compared to a proton?

Back

Approximately equal to a proton.