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24 Cards in this Set
- Front
- Back
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Mixture can be broken down into ___________ and ____________.
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homogeneous and hetrogeneous
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What did the Greeks bring to the development of the atomic theory?
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Greeks developed the concept of an atom and named the atom
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Neils Bhor decided the electrons did what?
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electrons orbited the neucleus in energy levels
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Define atom
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smallest units of matter that retains the properties of matter
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What did John Dalton?
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all elements made of small spherical shapes called atoms and atoms from one element differ from others.
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Who invented the periodic table and how was the table arranged?
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Demitri Mendleev and by atom mass numbers
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Example of a element, compund and mixture.
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oxygen, water, salad dressing
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What did Thompson dicover?
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atoms had a positive center with negativ electrons attached to it.
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Why is group 18 called noble gases?
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they won't bond with any other elements and they are all stable
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How is the periodic tbale aranged today
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atomic number
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Name groups 1,2,3-12,17,18
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1-Alkali metals 2-alkaline earth metals 3-12-transition elements 17-hatogens 18- noble gases
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How many periods and groups are on the table?
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7 periods and 18 groups
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How does the group number help you draw dot models? How does the period number help you draw atom models?
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valence electrons
amount of energy levels |
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Why does the periodic table give average atomic mass numbers?
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because there might be an istope for that element
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Define isotope and valence electrons
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isotope-atoms of the same element with diff.#'s of neutrons.
valence electrons-outer most electrons |
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Substances can be broken down into __________ and ___________.
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elements and compounds
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Matter can be classified in what two ways?
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a substance and mixture
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What are the two types of chemical bonds and how can you tell the difference between the two?
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ionic bond and covalent bond.
ionic bond is a transfer covalent bond is a share. |
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what is the area that electrons are in called?
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electron cloud
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which phose of matter has the least kenetic energy?__________
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solida
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In an ionic bond metals become ________ ions and the nonmetals becom _______ ions.
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positive and negative
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define ion
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a positively or negatively charged atom
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Rutford's gold foil experiment brought the discovery of what?
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said an atom had empty space with a positive core called the neucleu surronded by electrons.
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which phase of matter has the least knetic energy?
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solids
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