Atomic Theory

Front

What is the main idea of atomic theory?

Back

Atomic theory states that matter is composed of discrete units called atoms, which are the fundamental building blocks of all substances.

Front

Who is known as the father of modern atomic theory?

Back

John Dalton is known as the father of modern atomic theory.

Front

What are the four main postulates of Dalton's atomic theory?

Back

1. All matter is made of atoms. 2. Atoms of a given element are identical in mass and properties. 3. Compounds are formed by a combination of two or more different kinds of atoms. 4. A chemical reaction involves a rearrangement of atoms.

Front

What is the nucleus of an atom?

Back

The nucleus is the central region of an atom that contains protons and neutrons.

Front

What charge do protons carry?

Back

Protons carry a positive charge.

Front

What is the charge of neutrons?

Back

Neutrons have no charge; they are neutral.

Front

What did Ernest Rutherford discover about the atom?

Back

Ernest Rutherford discovered the nucleus of the atom through his gold foil experiment.

Front

What is the role of electrons in an atom?

Back

Electrons are negatively charged particles that orbit the nucleus and are involved in chemical bonding.

Front

According to Niels Bohr, where are electrons located?

Back

Niels Bohr suggested that electrons are found in specific orbits around the nucleus.

Front

What is the significance of the gold foil experiment?

Back

The gold foil experiment demonstrated that atoms have a small, dense nucleus and that most of the atom is empty space.