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| _________ grew as a series of models that developed from expermental evidence. As more evidence collected, it and the models were revised. |
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| The English scientist who inferred that atoms had main characteristics including that every compound is composed of atoms of different elements, combined in a specific ratio. |
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| ________ model of the atom described an atom that consisted of negative charges scattered throughout a ball of positive charge. |
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| The important part of the atom Rutherford discovered. |
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| What was the name of the experiment Rutherford performed in his discovery? |
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| A ______ is a tiny region in the center of an atom. |
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| A ______ is a positively charged particle in the nucleus of an atom. |
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| They can be anywhere in a cloudlike region around the nucleus. |
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| What was Bohr's important discovery concerning electrons? |
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| An electrons movement is related to its ________, or specific amount of energy it has. |
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| Which British scientist discovered ghe neutral particle in the nucleus called the nuetron? |
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| It's located in the nucleus. |
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| Where is the nuetron located in an atom? |
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| Nucleus, protons, nuetrons, electrons |
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Definition
| The modern model describes an atom as consisting of a _____ that contains _____ & _____ surrounded by a cloudlike region of moving _______. |
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| What is 1 atomic mass unit? |
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| It tells the amount of protons in the nucleus. |
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| What does the atomic # tell u? |
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| Atoms with the same # of protons & a different # of nuetrons are called ______. |
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| An isotope is identified by its _________, which is the sum of the protons & neutrons in the nucleus. |
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| By 1869,a total ___ elements had been discovered. |
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| Who was the Russian scientist taht discovered a set of patterns that applied to all element? |
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| ______ is the average mass of all the isotopes of an element. |
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| The ______ ______ is a chart of the eelements showing the repeating pattern of their properties. |
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| Can the properties of an element be predicted from its location on the periodic table? |
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| The periodic table is arranged by increasing ___________. |
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| The periodic table is organized in ______. |
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| The elements in the periodic table fall into 18 vertical columns called ______. |
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| Shininess, malleaablility, ductility, conductivity |
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| What r the 4 physical properties of metals? |
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| A _____ material is one that can be pulled out, or drawn, into a long wire. |
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| A _____ material is one that can be hammered or rolled into flat sheets and other shapes. |
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| ___________ is the ability of an object to transfer heat or electricity to another object. |
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| What is the ease and speed with which an element combines, or reacts with other elementsand compounds. |
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| What's the destruction of metals through a chemical reaction? |
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| The reactivity of metals tends to decrease as u move ____ to ____ across the periodic table. |
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| All metals in group 1 are ______ metals. |
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| They react with other elements by losing 1 electron.They're so reactive that they"re never found uncombined in nature. |
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| What r some characteristics of Alkali metals? |
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| All the metals in group 2 r the ___________ metals. |
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| The elements in group 3-12 r called the __________ metals. |
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| Some of the elements in groups 13-15. Most common r aluminum, tin, & lead. |
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| What r the Metals in Mixed Groups? |
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| What's the name of the series of elements on the top row of the last 2 rows at the bottom of the periodic table? |
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| An ____ is a mixture of a metal with at least 1 other element, usually another metal. |
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| What's the name of the series of elements on the bottom row of elements on the periodic table? |
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| What's the heaviest (or largest) element on Earth? |
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| Elements with atomic numbers larger than 92 r called_________. (They r'nt found naturally on Earth.) |
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| A ______ is an element that lacks most of the properties of a metal. |
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| Most nonmetals r poor conductors of ____ and ________, and r reactive with other elements. |
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| Solid metals r ________ and ________. |
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| What's the only nonmetal that is liquid at room temperature? |
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| They are dull and brittle. |
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| What r some properties of solid metals? |
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| ________ is the most reactive element known. |
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| Do nonmetals usually gain/shareor lose electrons? yes or no. |
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