History of Atomic Theory

Front

Who proposed the first modern atomic theory?

Back

John Dalton proposed the first modern atomic theory in the early 19th century.

Front

What is the Law of Conservation of Mass?

Back

The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction.

Front

Describe J.J. Thomson's model of the atom.

Back

J.J. Thomson proposed the 'plum pudding' model, where electrons are embedded in a positively charged 'soup'.

Front

What did Ernest Rutherford discover about the atom?

Back

Ernest Rutherford discovered that the atom has a small, dense nucleus surrounded by electrons.

Front

What is Niels Bohr known for in atomic theory?

Back

Niels Bohr is known for proposing that electrons move in fixed orbits around the nucleus.

Front

Who is credited with the discovery of the neutron?

Back

James Chadwick is credited with the discovery of the neutron in 1932.

Front

What is Dalton's Atomic Theory?

Back

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

Front

What does the term 'atomic number' refer to?

Back

The atomic number refers to the number of protons in the nucleus of an atom.

Front

What is the significance of the gold foil experiment?

Back

The gold foil experiment conducted by Rutherford demonstrated that atoms have a dense nucleus.

Front

What is the difference between an atom and a molecule?

Back

An atom is the smallest unit of an element, while a molecule is a group of two or more atoms bonded together.