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7 CK Atomic Struct

7th CK SCI Atomic Structure COMPLETE

TermDefinition
amu Atomic Mass Unit, the unit used to weigh subatomic particles
Atom the smallest piece of matter
Atomic mass the average of all the mass numbers of all the isotopes of an element that occurs in nature
Atomic number the number of protons in the nucleus of an atom
Corpuscle negative subatomic particle in the atom discovered by J.J. Thomson; today it is known as an electron
Electron cloud the area surrounding the nucleus where electrons are found
Element the simplest pure substance
Indirect evidence evidence that is gained based on observation
Isotope an atom of a given element with a different number of neutrons than protons
Mass number the sum of the number of protons and neutrons contained in an atom’s nucleus
Matter anything with mass and volume
Molecule two or more atoms chemically bonded together
Neutron subatomic particle with no charge located in the nucleus of the atom
Nucleus the center of positive charge in the nucleus; discovered by Ernest Rutherford
Proton subatomic particle with a positive charge located in the nucleus of the atom
Pure substance a substance in which all particles are alike
Subatomic particle particle smaller that the atom
Created by: artisteacher