Unit 3 Vocabulary Terms

Atomic Theory

The theory that all matter is made up of tiny indivisible (unable to be separated) particles (atoms).

• http://www.discovery.com/tv-shows/other-shows/videos/assignment-discovery-shorts-development-of-atom-theory.htm

Atom

• The basic unit of a chemical element

https://www.youtube.com/watch?v=o-3I1JGW-Ck

Subatomic Particles

• A particle smaller than an atom (e.g. a neutron) or a cluster of such particles.

• http://www.discovery.com/tv-shows/other-shows/videos/assignment-discovery-shorts-development-of-atom-theory.htm

Proton

• A positively charged subatomic particle that is found in the nucleus of an atom.

http://media-cache-ak0.pinimg.com/originals/98/43/e5/9843e5367effb0340a84c815adc872f6.jpg

Neutron

• A neutral subatomic particle that is found in the nucleus of an atom.

http://cartoonpicturecollection.blogspot.com/2010/03/jimmy-neutron-best-wallpaper-gallery.html

Electron

• A negatively charged subatomic particle that is found in the space outside the nucleus of an atom.

http://www.chem4kids.com/files/atom_electron.html

Electron Cloud

• A visual model of the most likely locations for the electrons in an atom.

http://letstalkaboutscience.wordpress.com/2012/02/16/the-electron-cloud/

Nucleus

• The dense, positively charged mass located in the center of an atom.

http://www1.whsd.net/courses/J0078/Periodic__Table/atom.html

Atomic Number

• A unique number for each element that equals the number of protons in an atom of that element.

http://chemwiki.ucdavis.edu/Physical_Chemistry/Atomic_Theory/The_Atom/Sub-Atomic_Particles

Mass Number

• The sum of the number of protons and neutrons in the nucleus of an atom.

http://chemwiki.ucdavis.edu/Physical_Chemistry/Atomic_Theory/The_Atom/Sub-Atomic_Particles

Quark• A subatomic particle theorized to be among

the basic units of matter. https://the-history-of-the-atom.wikispaces.com/Murray+Gell-Mann

AMU- Atomic Mass Unit

• A unit of mass used to express atomic and molecular weights, equal to one-twelfth of the mass of an atom of carbon-12. It is equal to approximately 1.66 X 10 -27 kg.

http://chemwiki.ucdavis.edu/Physical_Chemistry/Atomic_Theory/The_Atom/Sub-Atomic_Particles

Attract

• The force attracting atoms to each other and binding them together in a molecule.

http://chemwiki.ucdavis.edu/Physical_Chemistry/Quantum_Mechanics/Atomic_Theory/Electrons_in_Atoms/Multi-electron_Atoms

Crash Course Video

• https://www.youtube.com/watch?v=thnDxFdkzZs

1. A negatively charged subatomic particle that is found in the space outside the nucleus

of an atom.

A. ElectronB. ProtonC. NeutronD. Quark

2. The theory that all matter is made up of tiny indivisible (unable to be separated)

particles (atoms).

A. Subatomic ParticlesB. Atomic NumberC. AMUD. Atomic Theory

3. A particle smaller than an atom or cluster of such particles.

A. AtomB. QuarkC. Subatomic ParticlesD. Mass Number

4. A visual model of the most likely locations for the electrons in an atom.

A. Atomic TheoryB. Electron CloudC. Mass NumberD. Quark

5. A unit of mass used to express atomic and molecular weights, equal to one-

twelfth of the mass of an atom of carbon-12

A. AMU- Atomic Mass UnitB. Mass NumberC. AtomicD. Electron

6. The sum of the number of protons and neutrons in the nucleus of an atom.

A. AMUB. ProtonC. Atomic TheoryD. Mass Number

7. A unique number for each element that equals the number of protons in an atom of

that element.

A. Mass NumberB. Atomic NumberC. ElectronsD. Protons