CH. 17-18
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| element | any pure substance that is made of only one kind of atom.
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| alchemy | aspects of chemistry, philosphy, religion, metallurgy, medicine and art.
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| periodicity | the repitition of certain properties at regular intervals when elements were placed in the order of atomic mass
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| metals | belong to families with relitivley few valience electrons.
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| nonmetals | hold electrons tightly, properties are very different from metals.
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| periods | ---- horizontal rows of elements ----
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| electronn affinity | deals with the strength of the attracton of electrrons
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| chemical symbols | berzelium's notation consisting of one or two letters derived from the elements name
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| monatomic | occur as single atoms
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| diatomic | hydrogen nitrogen oxygen fluorine chlorine bromine iodine
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| octet rule | full 8 electrons in their valence electricity level
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| electron affinity | how well it holds and attracts electrons
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| electronegativity | an atoms ability to attract and hold atoms when bonded to other atoms
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| ionic bond | between metals and nonmetals
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| covalent bond | mostly between nonmetals
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| metallic bond | atoms bond by sharing their easily lost electrons among atoms
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| Lewis structure | molecular notation
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| double bonds | stronger than single bonds
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| triple bonds | each atom must share three electrons to complete its octet
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| polyatomic molecules | molecules made up of three or more atoms
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| polar covalent bond | uneven electron sharing
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| nonpolar bonds | bonds with no polarity. formed by diatomic elements
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| covalent compounds | consist of covalently bonded molecules
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| ionic compounds | formed by ionic bonds
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| crystal lattice | mobile ions clump together with opposite charges
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| formula unit | the smallest ratio of elements in an ionic compound
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| unit cells | groupings of ions
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| electron sea theory | a model of the bonding of metals and their properties
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