History of Atomic Chemistry

"Atomos" is the Greek word meaning

• Round
• Particle
• Pure
• Indivisible

The nucleus of the atom is composed of

• Protons and Electrons
• Electrons and Neutrons
• Protons and Neutrons
• Protons, Neutrons, and Electrons

Electrons are ___________ and found in the _________________ around the nucleus.

• positive, nucleus
• positive, electron cloud
• negative, nucleus
• negative, electron cloud

The atomic number represents the number of _____________ in an atom of an element.

• Protons
• Neutrons
• Electrons
• Protons and Neutrons

How do you calculate the atomic mass of an element?

• Add protons and electrons
• Add protons and neutrons
• Add electrons and neutrons
• Add protons, neutrons, and electrons