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24 Cards in this Set
- Front
- Back
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What Is Matter?
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Anything that has mass and takes up space.
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Name 5 things that are not matter.
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Light, heat, emotion, thoughts & ideas.
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What does atom mean in greek?
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"Cannot be divided"
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Define Atom
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A small particle that makes up most types of matter.
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What does The Law of Conservation of Matter state?
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Matter is neither created nor destroyed.
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Define Electron
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A negatively charged particle.
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Who discovered the electron?
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J.J Thompson
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Define Nucleus
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The positively charged central part of the atom.
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Define Proton
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A positively charged particle
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Who discovered the proton?
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Ruherford
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Define Neutron
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Uncharged particles in the nucleus of an atom.
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Who discovered the neutron?
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James Chadwick
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Define Element
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A material that cannot be broken down to simpler materials by ordinary means.
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What does atomic number tell you?
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The number of protons in the nucleus of each atom of that element.
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What does the atomic mass tell you?
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How heavy its atoms are compared with atoms of other elements.
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Mass Number=.....
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sum of protons and neutrons
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Neutrons=.......
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Mass # - Protons
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__________ generally have a shiny or metallic luster
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Metals
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_____________ are good conductors of heat and electricity.
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Metals
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_____________are elements that are usually dull and most are poor comductors.
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Nonmetals
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____________ are elements that have the characteristics of metals and nonmetals.
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Metalloids
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Who published the first periodic table?
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Dimitri Mendeleev
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Define Substance
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A sample of matter that has the same composition & properties throughout.
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Define Compound
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A pure substance whose smallest unit is made up of atoms of more than one element.
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