Front

Who was the first person to come up with the idea of the atom?

Back

Democritus

Front

Which scientist is responsible for first discovering that all the atoms of a particular element are identical but are different from the atoms of all other elements?

Back

Dalton

Front

Dalton showed that common substances always broke down into _____

Back

the same elements in the same proportions

Front

What was Thomson's model of the atom?

Back

Thomson believed the atom was a smooth, hard marble with a positive charge, containing negatively charged particles.

Front

Which philosopher stated that matter was made of four elements: earth, wind, water, and fire?

Back

Aristotle

Front

What is the atomic theory proposed by Dalton?

Back

Dalton's atomic theory states that all matter is made of atoms, which are indivisible and indestructible particles.

Front

What did Democritus contribute to the atomic theory?

Back

Democritus proposed that everything is made up of atoms, which are small, indivisible, and indestructible.

Front

What is the significance of Dalton's experiments with gases?

Back

Dalton's experiments led to the formulation of the law of multiple proportions, which states that when elements combine, they do so in ratios of small whole numbers.

Front

What did Thomson discover about the electron?

Back

Thomson discovered the electron as a negatively charged particle within the atom.

Front

What is the main idea of 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 it.