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30 Cards in this Set
- Front
- Back
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_____ organized the element in a useful chart according to their ___ _____.
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Mendeleev
atomic mass |
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How is Mendeleev's table different from the periodic table used today?
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The current table is organized according to atomic number not atomic mass.
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What was an important feature of Mendeleev's table.
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Mendeleev left blanks in his table because he knew more elements would be found.
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_____ came up with the periodic table organized by atomic number.
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Moseley
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What determines the chemical properties of an element?
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The number of electrons in the outer most energy level.
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The ____ the electrons are to the nucleus, the weaker the electron.
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closer
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Give the maximum number of electrons in each energy level.
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1st energy level - 2
2nd energy level - 8 3rd energy level - 18 4th energy level - 32 |
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In order for an element to be stable, how many electrons are needed in the outer most energy level?
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8 electrons
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The __ ____ is the number of electrons in each energy level.
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electron configuration
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The electrons in the outermost level are known as the __ ___.
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valence electrons
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In looking at the periodic table, all elements in vertical columns are known as ___ or ______.
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groups or families
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What do the elements in groups have in common?
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They all have the same number of valence electrons.
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Group 1, found at the left side of the periodic table, are known as ____ ____.
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alkali metals
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Group 2 is the family known as ___ ___ _____.
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akaline earth metals
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The family in the middle of the table (columns 3-12) are strong metals called __ ___.
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transition metals
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Give the name of the groups 13-18.
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13 - Boron Group
14- Carbon Group 15 - Nitrogen Group 16- Oxygen Group 17- Flourine Group 18 - Noble Gases |
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The three classes of elements:
1 2 3 |
1. metals
2. nonmetals 3. metalloids |
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____ of the elements on the periodic table are metals.
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3/4
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List the common charactertistics of metals:
1 2 3 4 |
1. luster
2. malleable 3. ductile 4. conductive - heat/electricity |
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_____ have both metals and nonmetal properties.
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Metalloids
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_______ metals have a slight conductive property which allows scientist to control the amount of electricity flowing through the metal.
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Semiconductor
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Characteristics of nonmetals:
1 2 3 |
1. no luster
2. not malleable or ductile 3. gaseous state 4. poor conductors |
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____ is a substance that produces ions upong dissolving.
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Electrolytes
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A bond that involves ____ one or more pairs of electrons between two atoms is called _____ ______.
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sharing
convalent bonding |
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Two atoms of the same element that bond together to form a unit is called __ ___; like H2 or 02.
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diatomic molecule
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Many ____ consist of diatomic molecules.
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gases
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____ is an element that exists naturally as a diatomic molecule.
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Hydrogen
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When an atom shares two electrons in order to bond, it is called __ ___.
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double bond
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An organic compound will always contain _______.
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carbon
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The basic unit of a covalent compound is the ___.
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molecule
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