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Ch. 17


Atom the smallest piece of matter that still retains the property of the element.
Nucleus Protons and neutrons are found in a small, positively charged center of the atom
Proton are particles with an electrical charge 1+.
Neutron are neutral particles that do not have electrical charge.
Electron are particles with an electrical with of 1-
Quark Protons and neutrons, however, are made up of smaller particles
Electron Cloud the area around the nucleus of an atom where its electrons are molt likely found.
Atomic Number The number of protons in an atom is equal to a number
Mass number Atom is the sum of the number of protons and the number of neutrons in the nucleus of an atom.
Isotope Atoms of the same element that have different numbers of neutrons.
Average Atomic Mass the weighted average mass of the mixture of its isotopes.
Periodic Table The elements are arranged by increasing atomic number and by changes in physical and chemical properties
Group The vertical columns in the periodic table
Electron Dot Diagram the symbol of the element and dots to represent the electrons in the outer energy level.
Period The horizontal rows of elements on the periodic table.
Created by: airiktorrescruz