Science MCQs

An atom is the smallest particle of an element that retains the properties of that element.

Democritus was a Greek philosopher who first proposed the concept of the atom.

John Dalton proposed the first scientific atomic theory.

Atoms are composed of protons neutrons and electrons.

Protons and neutrons are found in the nucleus at the center of the atom.

Electrons carry a negative charge and orbit the nucleus.

Protons have a positive charge and are located in the nucleus.

Neutrons have no charge (neutral) and are found in the nucleus.

The positive charge of protons balances the negative charge of electrons.

The atomic number is the number of protons in the nucleus of an atom.