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9 Cards in this Set

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Define:
Matter
Matter is defined as anything that occupies space and has mass.
Define: O,C,H,N,Ca,P,K,S,Na,Fe,Mg.
Oxygen, Carbon, Hydrogen, Nitrogen, Calcium, Phosphorus, Potassium, Sulfur, Sodium, Iron, Magnesium
Define:Atoms
Protons
Neutrons
Electrons
Atom: Smallest units of matter that retains the properties and characteristics of an element.
Define:Protons
Neutrons
Electrons
Subatomic particles with a (+) charge. Found within the nucleus
Define:Neutrons
Subatomic particle neutral charge. Found with in the nucleus.
Define:Electrons
Subatomic particles found outside of the nucleus that have a (-) charge
Define: Isotopes
Atoms of an element that have different numbers of neutrons and therefore have different mas numbers.
Define: Half life
The time required far half of the radioactive atoms in a sample of that isotope to decay into a more stable form.
Define: Atomic number
The number of protons in the nucleus of an atom.