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23 Cards in this Set
- Front
- Back
- 3rd side (hint)
What is a negatively charged ion?
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anion
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think about what negative starts with.
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atom
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The smallest unit of matter that retains the properties of an element.
C,H,O,P,N,S |
think size.
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C,H,O,P,N,S
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atoms.
carbon, hydrogen, oxygen, phospate, nitrogen, sulfur. |
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what's the order of the hierarchy of structural levels?
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atomic, molecular, organelle, cellular, tissue, organ, organ system, organism.
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define compound
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substance consisting of two or more elements combined in a fixed ration.
ie. table salt. |
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The total atomic mass, which is the mass in grams of one mole of the atom.
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Atomic weight
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atomic number
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The number of protons in the nucleus of an atom, unique for each element and designated by a subscript to the left of the elemental symbol.
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substance that cannot be broken down to other substances by chemical reactions.
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element
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How many elements occur in nature?
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92
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what are subatomic particles?
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neutrons, protons, and electrons.
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define mass number
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the sum of protons and neutrons in the nucleus of an atom. Written as a superscript before the element.
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difference between atomic number and mass number?
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mass number uses both protons and neutrons, atomic uses only protons.
mass- superscript atomic- subscript. |
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define isotope
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one of several atomic forms of an element, each containing a different number of neutrons (changing atomic mass).
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what is potential energy?
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energy that matter stores because of its position of location.
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what are trace elements?
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elements required by an organism in minute quantities.
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where are neutrons and protons found?
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in the atomic nucleus.
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what are the charges in an atom?
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proton- positive.
neutron- neutral. electron- negative. |
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what isotope makes the nucleus decay spotaneously?
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Radioactive.
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why are radioactive isotopes important?
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they are used as tracers to follow atoms through metabolism, the chemical processes of an organism.
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define energy
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the ability to do work.
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true/false: an electron can exist in between fixed states of potential energy.
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false
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what is a covalent bond?
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A type of strong chemical bond in which two atoms share one pair of valence electrons.
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define electronegativity
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The attraction of an atom for the electrons of a covalent bond.
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