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/othershows/videos/assignmentdiscovery-shortsdevelopment-of-atomtheory.htm
Atom
• The basic unit of a chemical element
https://www.youtube.com/w
atch?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/tvshows/other-shows/videos/assignmentdiscovery-shorts-development-of-atomtheory.htm
Proton
• A positively charged subatomic particle that
is found in the nucleus of an atom.
http://media-cacheak0.pinimg.com/originals/98/43
/e5/9843e5367effb0340a84c81
5adc872f6.jpg
Neutron
• A neutral subatomic particle that is found in
the nucleus of an atom.
http://cartoonpicturecollection.blog
spot.com/2010/03/jimmy-neutronbest-wallpaper-gallery.html
Electron
• A negatively charged subatomic particle that
is found in the space outside the nucleus of
an atom.
http://www.chem4kids.co
m/files/atom_electron.ht
ml
Electron Cloud
• A visual model of the most likely locations for
the electrons in an atom.
http://letstalkab
outscience.word
press.com/2012
/02/16/theelectron-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/Phy
sical_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_T
heory/The_Atom/SubAtomic_Particles
Quark
• A subatomic particle theorized to be among
the basic units of matter.
https://the-history-of-the-atom.wikispaces.com/Murray+GellMann
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/Phy
sical_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_Mechani
cs/Atomic_Theory/Electrons_in_Atoms/Multi-electron_Atoms
Crash Course Video
• https://www.youtube.com/watch?v=thnDxFdk
zZs
1. A negatively charged subatomic
particle that is found in the space
outside the nucleus of an atom.
A.
B.
C.
D.
Electron
Proton
Neutron
Quark
2. The theory that all matter is made
up of tiny indivisible (unable to be
separated) particles (atoms).
A.
B.
C.
D.
Subatomic Particles
Atomic Number
AMU
Atomic Theory
3. A particle smaller than an atom or
cluster of such particles.
A.
B.
C.
D.
Atom
Quark
Subatomic Particles
Mass Number
4. A visual model of the most likely
locations for the electrons in an atom.
A.
B.
C.
D.
Atomic Theory
Electron Cloud
Mass Number
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.
B.
C.
D.
AMU- Atomic Mass Unit
Mass Number
Atomic
Electron
6. The sum of the number of protons
and neutrons in the nucleus of an
atom.
A.
B.
C.
D.
AMU
Proton
Atomic Theory
Mass Number
7. A unique number for each element
that equals the number of protons in
an atom of that element.
A.
B.
C.
D.
Mass Number
Atomic Number
Electrons
Protons