Atomic History

Front

What is the Plum Pudding Model?

Back

A model proposed by J.J. Thomson that describes the atom as a sphere of positive charge with negatively charged electrons embedded within it.

Front

Who proposed the idea that atoms are mostly empty space?

Back

Ernest Rutherford, through his gold foil experiment, demonstrated that atoms consist mostly of empty space with a small, dense nucleus.

Front

What did Ernest Rutherford discover about the atom?

Back

He discovered that the atom has a small, dense, positively charged center known as the nucleus.

Front

Define 'orbital' in the context of atomic structure.

Back

An orbital is a region in an atom where there is a high probability of finding an electron.

Front

Who was the first to suggest that atoms can be divided into smaller parts?

Back

J.J. Thomson, who discovered electrons, indicating that atoms are not indivisible.

Front

What is the significance of the gold foil experiment?

Back

It provided evidence for the existence of a nucleus in the atom and showed that atoms are mostly empty space.

Front

What did John Dalton contribute to atomic theory?

Back

John Dalton proposed that all matter is made of atoms, which are indivisible and indestructible.

Front

Explain the concept of atomic mass.

Back

Atomic mass is the weighted average mass of an element's isotopes, measured in atomic mass units (amu).

Front

What is the difference between an atom and an ion?

Back

An atom is neutral, having equal numbers of protons and electrons, while an ion has a net charge due to the loss or gain of electrons.

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.