Matter Chapter 4

NUCLEUS
Small, dense positively charged center of an atom.
SUBATOMIC PARTICLE
Proton, neutron, and electron
PROTON
Subatomic particle that has a positive charge and is found in the nucleus of an atom.
Atomic Mass Unit (amu)
Unit used to measure the masses of subatomic particles; a proton has a mass of 1 amu
Neutron
Subatomic particle with no electric charge that is found in the nucleus of an atom.
Atomic Number
Number of protons in the nucleus of an atom
Isotope
Atom of an element that has the same number of protons as another atom of the same element but a different number of neutrons.
Mass Number
Sum of the protons and neutrons in the nucleus of an atom.
Atomic Mass
Average of the masses of the existing isotopes of an element.
Electron
Negatively charged subatomic particle found in an area outside the nucleus of an atom
Electron Cloud
Space in which electrons are likely to be found.
Energy Level
Most likely location in an electron cloud in which an electron can be found.
Quark
Particle that makes up all other known particles in the nucleus of an atom
ELECTROMAGNETIC FORCE
Force of attraction or repulsion between articles in an atom.

Strong Force

Force that binds protons and neutrons in the nucleus.
Weak Force
Force that is the key to the power of the sun; responsible for a process known as radioactive decay.
Gravity
Force of attraction between all objects in the universe.
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