Atomic models

What did Democritus propose about the composition of matter?

• Matter is made of four elements: earth, wind, water, and fire.

• Everything is made up of tiny, indivisible particles surrounded by empty space.

• Atoms are uniformly packed spheres of positive matter with negatively charged electrons.

• Electrons orbit the nucleus at fixed energy levels.

What was Aristotle's belief about the fundamental components of matter?

• Matter is composed of tiny, indivisible particles called atomos.

• Matter is made of four elements: earth, wind, water, and fire.

• Matter consists of a positively charged sphere with electrons embedded within it.

• Matter is primarily empty space with a dense nucleus.

What was a key conclusion from John Dalton's work on atomic theory?

• Atoms are indivisible and cannot be created or destroyed.

• Substances always break down into different elements in varying proportions.

• Atoms are composed of smaller, subatomic particles.

• Electrons orbit the nucleus in specific energy shells.

What was J.J. Thomson's significant discovery that led to a new atomic model?

• The existence of a dense, positively charged nucleus.

• That electrons orbit the nucleus at fixed energy levels.

• The electron, leading to the "chocolate chip cookie" model of the atom.

• The Uncertainty Principle regarding electron position and speed.

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What did Ernest Rutherford's gold foil experiment reveal about the atom?

• Atoms are uniformly packed spheres of positive matter.

• Electrons are negatively charged particles.

• Atoms consist largely of empty space with a dense, positively charged nucleus.

• Electrons behave like waves and cannot be precisely pinpointed.