Matter Chapter 4 Atoms: Building Blocks of Matter Flashcards
Nucleus
The nucleus is small, dense positively charged atom.
Subatomic Particle
It is a neutron, electron, or proton.
Proton
A proton is a subatomic particle that has a positively charge and found in the nucleus.
Atomic Mass
The average of the masses of the existing isotope in an element.
Neutron
A subatomic particle with no electric charge, and is found in the nucleus.
Atomic Number
It is the number of protons in the nucleus of an atom.
Isotope
An isotope is an element that has a different number of neutrons average element.
Mass Number
The sum of protons and neutrons in the nucleus of an atom.
Atomic Mass Unit
It is used to find the mass of a subatomic particle. (like a proton has one atomic mass unit.)
Electron
It is a negatively changed subatomic particle that is found in the electron cloud.
Electron Cloud
It is the space where electrons are most likely to be found in.
Energy Level
The location with in the electric cloud that an electron remains.
Quark
A particle that makes up all other known particles in the nucleus.
Electromagnetic Force
It can either attract or repel the particles on which it acts. Opposites charges attract, like charges repels.
Strong Force
Opposes the electromagnetic force of repulsion of the protons. The strong force “glues” the protons together to make the nucleus.
