Atomic theory

Front

Who was the first to propose that matter is comprised of fundamental indivisible particles?

Back

Democritus

Front

Which scientist provided the first empirical evidence that atoms exist?

Back

John Dalton

Front

What did John Dalton propose about compounds?

Back

They consist of different types of atoms in whole number ratios

Front

What did JJ Thomson discover in his cathode ray experiment?

Back

Electrons

Front

What was Ernest Rutherford's gold foil experiment about?

Back

Discovering the nucleus

Front

What did Ernest Rutherford's experiment suggest about the atom's structure?

Back

Atoms are mostly empty space

Front

What is the significance of the atomic theory in chemistry?

Back

It provides the basis for understanding chemical reactions.

Front

What did JJ Thomson propose about the distribution of charges in an atom?

Back

They are positive and negative

Front

What did John Dalton's atomic theory explain about the mass ratio of hydrogen and oxygen in water?

Back

1/9 hydrogen and 8/9 oxygen by mass

Front

What did Ernest Rutherford's experiment with alpha particles suggest about the atom's nucleus?

Back

It is positively charged