History of the atomic model

Front

Who used the word 'atomos' to describe the indivisible atom?

Back

Democritus

Front

What did Dalton propose about atoms in his Atomic Theory?

Back

Atoms were the smallest particles that existed and could not be divisible.

Front

What was observed during the gold foil experiment when alpha particles were shot at gold foil?

Back

Most of the alpha particles went straight through but a few bounced back.

Front

Which scientist first suggested that atoms could join?

Back

Democritus

Front

What subatomic particle was discovered as a result of the cathode ray experiment?

Back

Electron

Front

What is the main idea of Dalton's Atomic Theory?

Back

Atoms are indivisible and combine in simple whole-number ratios to form compounds.

Front

What did Thomson discover about the atom?

Back

He discovered the electron and proposed the 'plum pudding' model of the atom.

Front

What was Rutherford's conclusion from the gold foil experiment?

Back

Atoms have a small, dense nucleus that is positively charged.

Front

What is the significance of the term 'nucleus' in atomic structure?

Back

The nucleus is the central part of an atom, containing protons and neutrons.

Front

What did Bohr contribute to the atomic model?

Back

He proposed that electrons orbit the nucleus in fixed paths or energy levels.