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Atomic Theory
Term | Definition |
---|---|
Matter | anything that has mass and takes up space. ALL solids, liquids, & gases |
Atom | The smallest particle that has the characteristics of that element |
Subatomic Particles | The smaller parts that make an atom - Protons, neutrons, & electrons |
Proton | Positive charge, found in the nucleus, 1 AMU |
Neutron | Neutral charge, found in the nucleus, 1 AMU |
Electron | Negative charge, found in the electron cloud, .0005 AMU |
Element | A substance that cannot be broken down into any other substance by physical or chemical means. It is made of ONLY one type of atom. |
Periodic Table | An arrangement of the elements showing the repeating pattern of their properties. |
Atomic Number | The number of protons in the nucleus The number of electrons in the electron cloud |
Atomic Mass | The average mass of an atom number of protons + number of neutrons |
Period | Horizontal rows Each row has a new electron shell |
Groups/Families | Vertical columns Elements that share similar characteristics |