Atomic Structure

If it has mass and volume, it is...

• matter

• energy

• antimatter

If it has mass and volume it is composed of...

• energy

• atoms

"atomos"

• "uncuttable" atoms

• atoms with a nucleus

• atoms with an electron cloud

• atoms with electrons orbiting the nucleus

Bohr model of the atom

• cannot be broken down into smaller particles

• electrons orbiting the nucleus

• electrons scattered throughout

• electron cloud

J.J. Thomson's plum pudding model

• uncuttable atom

• positive atom with electrons scattered throughout

• electrons orbit the nucleus

• electron clouds surround the nucleus

Dalton -1808

• believed atoms cannot be divided into smaller particles

• believed atoms can be divided into smaller particles

Earliest idea of an atom

• 2,500 years ago; Democritus and Leucippus

• 1808; Dalton

• 1904; Thomson

• 1913; Bohr

protons, neutron, and electons

• subatomic particles

• pre-atomic particles

• post-atomic particles

• molecules

positive charge

• protons

• neutrons

• electrons

In the nucleus

• protons only

• electrons only

• neutrons only

• protons and neutrons

• protons, neutrons, and electrons