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Atom the smallest part of an element that retains all the properties of that element
Atomic Number the number of protons in an atom
Average Atomic Mass weighted-average mass of the mixture of the isotopes of that element
Electron negatively charged, fast-moving particle that moves through the empty space surrounding an atom's nucleus
Electron Cloud region surrounding an atom where there is a high probability of finding an electron
Electron Dot Diagram element symbol surrounded by dots representing the atom's valence electrons
Group a vertical column of elements in the periodic table; also called a family
Isotope atomic nuclei having the same number of protons but different numbers of neutrons
Mass Number the number after an element's name, representing the sum of its protons and neutrons
Neutron neutral subatomic particle in an atom's nucleus, composed of quarks
Nucleus extremely small, positively charged, dense center of an atom containing protons and neutrons
Period a horizontal row of elements in the modern periodic table of elements
Periodic Table chart that organizes all known elements into a grid arranged by increasing atomic number
Proton a subatomic particle in an atom's nucleus that has a positive charge of 1+; is composed of quarks
Quark elementary particles that make up protons and neutrons
Created by: adajahhoran