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Chapter 3.1

Composition of Matter

TermDefinition
Atoms Fundamental units of matter.
Atomic Number Number of protons in an atom.
Compounds Atoms of two or more elements that are joined together by chemical bonds.
Covalent Bonds Two atoms share one or more pairs of electrons.
Electrons Have a negative charge.
Elements Substances that cannot be broken down chemically into simpler kinds of matter.
Ionic Bonds Positive and negatively charged elements that are attracted by one another.( Na Cl)
Isotopes Atoms of the same element that differ in the number of neutrons they contain.
Mass Quantity of matter an object has,
Mass Number Sum of protons and neutrons in an atom.
Matter Anything that occupies space and has mass and takes up space.
Molecule Groups of atoms held togethre by covelent bonds.
Neutrons Has no electrical charge
Nucleus Central core of an atom: contains two subatomic particles; Protons and neutrons. Most of the mass is concentrated in this area
Protons Has a positive electrical charge
Radioisotopes Tend to release particles, radiant energy, or both. Useful in biological experiments because the radiation can be detected. C14 is an example.
Created by: michellerush630
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