History of the Atom

Front

What is the Thomson Model of the atom?

Back

The Thomson Model, proposed by J.J. Thomson, describes the atom as a sphere of positive charge with negatively charged electrons embedded within it, resembling a 'plum pudding'.

Front

What did Bohr discover about electron locations?

Back

Bohr discovered that electrons are located in circular orbits around the nucleus of an atom.

Front

Who was the Greek philosopher that first proposed the concept of the atom?

Back

Democritus was the Greek philosopher who called the smallest particle of matter an 'atom'.

Front

What did Rutherford's experiments reveal about the atom?

Back

Rutherford's experiments showed that atoms have a small, dense nucleus at their center, which contains most of the atom's mass.

Front

What is Dalton's Atomic Theory?

Back

Dalton's Atomic Theory states that all elements consist of indivisible particles called atoms, which cannot be created or destroyed.

Front

What is the nucleus of an atom?

Back

The nucleus is the central part of an atom, containing protons and neutrons, and is positively charged.

Front

What are protons?

Back

Protons are positively charged particles found in the nucleus of an atom.

Front

What are neutrons?

Back

Neutrons are neutral particles found in the nucleus of an atom, contributing to its mass.

Front

What are electrons?

Back

Electrons are negatively charged particles that orbit the nucleus of an atom in various energy levels.

Front

What is the Cloud Model of the atom?

Back

The Cloud Model describes the atom as having a nucleus surrounded by a cloud of electrons, where the exact position of electrons cannot be determined.