Unit 1/Atoms & the Periodic Table

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Atom
basic unit of matter
Chemical Bond
the force that holds atoms together
Comprise
to include or contain; to be made up of
Conductor
a material that allows heat and electricity to pass through it
Electron
a subatomic particle that has a negative charge
Electron Cloud
a region around the nucleus of an atom where electrons are likely to be found
Group
elements in the same vertical column of the periodic table; also called family
Malleable
able to be hammered or pressed permanently out of shape without breaking or cracking
Mass Number
the total number of protons and neutrons in the nucleus of an atom
Metal
a shiny, dense substance that easily conducts heat and electricity
Metalloid
element with physical and chemical properties of metals and nonmetals
Neutron
a subatomic particle that has no charge and that is found in the nucleus of an atom
Noble Gas
group 18 elements, extremely unreactive
Nonmetal
a group of elements that are poor conductors of heat and electricity
Nucleus
the tiny, dense central portion of an atom, composed of protons and neutrons
Period
a horizontal row of elements in the periodic table
Periodic Table
an arrangement of elements showing the repeating pattern of their properties
Proton
positively charged particle in the nucleus of an atom
Reactivity
the ease and speed with which an element combines, or reacts, with other substances
Subatomic Particle
particles found within the atom, mainly protons, neutrons, and electrons
Valence Electron
electrons on the outermost energy level of an atom