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Chapter 17 vocab

vocabulary

TermDefinition
atom the smallest piece of matter
nucleus center of an atom
proton particles with an electrical charge of 1+
neutron neutral particles that do not have an electrical charge
electron particles with an electrical charge of 1-
quark smaller particles
electron cloud the area around the nucleus of an atom where its electrons are most likely found
atomic number the number of protons in an aom is equal to a number
mass number the sum of the number of protons and the umber of neutrons in the nucleus of an atom
isotopes atoms of the same element that have different numbers of neutrons
average atomic mass an element is 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
groups families
electron dot diagram the symbol of the element and dots to represent the electrons in the outer energy level
periods the horizontal rows of elements on the periodic table
Created by: jtorres3
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