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Periodic Table

8.P.1

TermDefinition
Matter Has mass and takes up space
Atom smallest particle of matter that retains all the properties of its element
Proton positive subatomic particle that determines identity of the atom
Neutron neutral subatomic particle that holds the nucleus together
Electron negative subatomic particle that determines the reactivity of the atom
Element pure substance made up of just one type of atom
Compound pure substance made up of 2 or more different types of atoms chemically bonded in a certain ratio
Molecule pure substance made up of 2 or more atoms, the same or different, chemically bonded in a certain ratio
Mixture an impure substance that contains 2 or more elements or compounds physically together.
Homogeneous Mixture Appears the same throughout
Heterogeneous Mixture Individual parts can be identified; not uniform throughout
Atomic number Whole number on the periodic table that tells us the number of protons (and electrons) in the atom.
Atomic Mass Larger number on the periodic table that is the sum of protons + neutrons
Periodic Table Scientific tool used to organize all the elements.
Groups or Families The vertical columns on the periodic table
Periods The horizontal rows on the periodic table
Reactivity How likely an atom is to form chemical bonds with other atoms.
Inert Atoms that do not react
Property A characteristic used to explain material
Physical Property A characteristic that is observable and measurable without causing a chemical change to occur. Examples: Hard, Shiny
Chemical Property A characteristic observable only when a chemical change is occurring
Malleable Physical property : able to flatten the material into a thin, bendable sheet
Ductile Physical property : able to pull the material into a wire
Density How much stuff is in a given space; Mass / Volume; compaction of atoms
Oxidation Chemical Property : when material reacts with oxygen; rusting, rotting fruit
pH Chemical Property : measures how acidic or basic a substance is
Combustible Chemical Property : How likely the material is to catch on fire
Chemical Bond The electric force
Chemical Formula Made up of elements and how many atoms of each in a substance
Created by: KathrynCalderon
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