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Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
Atom   the basic unit of a chemical element.  
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Atomic mass   bottom number of a element  
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Atomic number   the mass of an atom of a chemical element expressed in atomic mass units.  
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Bohr diagram   The Rutherford–Bohr model of the hydrogen atom  
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Chemical formula   chemical formula is a way of expressing information about the proportions of atoms that constitute a particular chemical compound, using a single line  
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chemical symbol   the letter in the moddle  
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electron   has a - charge  
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energy level   rings  
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family   carbon family  
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Isotope   each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons  
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leptons   A lepton is an elementary,  
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Lewis structure   the letter with the ve-  
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matter   makes up stuff  
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metal   metal  
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metaloid   some what metal  
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neutron   has no charge  
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nomeatal   not metal  
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nucleus   middle  
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period   time  
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periodic table   table of elemements  
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proton   has a + charge  
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quark   any of a number of subatomic particles carrying a fractional electric charge, postulated as building blocks of the hadrons.  
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valence   outside  
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chemical equation   A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and formulae  
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chemical change   Chemical change is any change that results in the formation of new chemical substances.  
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compound   chemical bond  
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covalent bond   A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms  
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ion   An ion is an atom or a molecule in which the total number of electrons is not equal to the total number of protons  
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ionic bond   Ionic bonding is a type of chemical bond that involves the electrostatic attraction between oppositely charged ions  
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mixture   In chemistry, a mixture is a material system made up of two or more different substances which are mixed but are not combined chemically.  
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monomer   A monomer is a molecule that may bind chemically to other molecules to form a polymer  
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Oxidation   Oxidation is the loss of electrons or an increase in oxidation state by a molecule, atom, or ion  
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Petrochemicals   Petrochemicals, also called petroleum distillates, are chemical products derived from petroleum.  
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phyical change   change in state  
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polymers   Polymers are substances whose molecules have high molar masses and are composed of a large number of repeating units.  
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