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23 Cards in this Set
- Front
- Back
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atom
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the smallest unit of an element that can still be identified as that element
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proton
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a sub atomic particle that has a positive charge
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nucleus
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the center of every atom, contains at least one proton
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electron
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a sub atomic particle that has a negative charge
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atomic number
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the number of protons in an atom
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element
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a substance that contains only one kind of atom
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metal
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conduct heat and electricity well
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nonmetal
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does not conduct electricity and is not shiny or malleable
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periodic table
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a table arranged by atomic numbers
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compound
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a substance made of two or more elements that are chemically combined
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melting point
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when it gets so hot that solids change to liquid
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boiling point
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when a substance becomes a gas
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plasma
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when atoms stay neutral
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ATOMS ARE MOSTLY EMPTY SPACE
T OR F |
TRUE
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THE NUCLEUS HAS A POSITIVE CHARGE
T OR F |
TRUE
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ELECTRONS ARE POSITIVELY CHARGED
T OR F |
FALSE
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ELECTRONS ARE FOUND IN A CLOUD MODEL
T OR F |
TRUE
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What is the reasons elements are arranged in columns?
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Elements are arranged in columns by families and common properties.
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Describe what must happen for an atom to have a positive charge//negative charge
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---lose electrons-positive
---gains electrons-negative |
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Isotopes have the ______number of __________but different numbers of _________
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same
protons neutrons |
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how many isotopes of carbon are there? Name them:
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3
carbon 12 carbon 13 carbon 14 |
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How are compounds formed?
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electrons are lost, gained or spared among elements to form them
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How do compounds and elements differ?
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elements have one atom, and compounds have two forming together.
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