Atomic History (Scientists)

Front

Which scientist saw the atom as a solid sphere?

Back

John Dalton proposed that the atom is a solid sphere, marking the beginning of modern atomic theory.

Front

What did Ernest Rutherford discover about the structure of atoms?

Back

Ernest Rutherford discovered that atoms are mostly empty space, with a small, dense nucleus at the center.

Front

What model was created after the discovery of the electron cloud?

Back

The Quantum Mechanical model was developed after the discovery of the electron cloud, describing the probabilistic nature of electron locations.

Front

What does the term 'atomos' mean, according to Democritus?

Back

The term 'atomos' means 'uncut' or 'indivisible', referring to the smallest particles of matter.

Front

Who proposed that the atom consists mostly of empty space?

Back

Ernest Rutherford proposed that the atom consists mostly of empty space.

Front

What is Dalton's Atomic Theory?

Back

Dalton's Atomic Theory states that matter is made up of atoms, which are indivisible and indestructible.

Front

What did J.J. Thomson discover?

Back

J.J. Thomson discovered the electron and proposed the Plum Pudding model of the atom.

Front

What is the Plum Pudding model?

Back

The Plum Pudding model suggests that atoms are composed of a positively charged 'soup' with negatively charged electrons embedded within.

Front

What did Niels Bohr contribute to atomic theory?

Back

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

Front

What is the Quantum Mechanical model of the atom?

Back

The Quantum Mechanical model describes electrons as existing in probabilistic clouds around the nucleus, rather than fixed orbits.