Atomic Theory

Front

What is the nucleus of an atom?

Back

The nucleus is the dense, positively charged center of an atom, containing protons and neutrons.

Front

What did John Dalton propose about atoms?

Back

John Dalton proposed that elements are made of atoms, atoms of a given element are identical, and atoms cannot be subdivided, created, nor destroyed.

Front

True or False: The majority of an atom is made up of empty space.

Back

True.

Front

Where can electrons be found in an atom?

Back

Electrons can be found in the electron clouds surrounding the nucleus.

Front

What is the Electron Cloud Model?

Back

The Electron Cloud Model describes the regions around the nucleus where electrons are likely to be found, rather than fixed orbits.

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 electron clouds.

Front

What is atomic mass?

Back

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

Front

What is an isotope?

Back

Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.