DCE Chemistry Unit 3 Vocabulary
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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| mole | the amount of substance that contains 6.02 x 10 ^23 particles
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| molar mass | the mass of 6.02 x 10^23 particles of a substance
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| period | a row (going across) in the periodic table
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| group | a column (going down) in the periodic table
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| metal | a class of elements that are generally good conductors, ductile, malleable, and shiny
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| nonmetal | a class of elements that are generally not good conductors, not ductile, not malleable, and not shiny
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| semiconductor | also known as a metalloid; an element that has properties of both metals and nonmetals
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| valence electrons | electrons that are in the highest energy level of an atom
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| alkali metal | any metal in group 1A on the periodic table
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| alkaline earth metal | any metal in grou 2A on the periodic table
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| transition metal | any of the group B elements on the periodic table
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| halogen | any nonmetal in group 7A on the periodic table
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| noble gas | any element in group 8A on the periodic table
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| atomic size | the size of an atom as measured by one half the distance between two joined atoms of the same element
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| ionization energy | the energy required to remove an electron from an atom in the gaseous state
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| electron affinity | the ability of an atom to attract an electron to itself
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| Periodic Law | when the elements are arranged in order of increasing atomic number, there is a periodic repetition of their physical and chemical properties
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| Mendeleev | Russian chemist and teacher who organized the elements in a table in order of increasing atomic mass
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| electron shielding | the inner electrons of an atom repel the outer electrons, making the outer electrons feel the pull of the nucleus less
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| ion | an atom that has lost or gained electrons
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| ductile | able to be drawn into wire
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| malleable | able to be hammered into flat sheets
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| conductive | able to transfer heat or electricity through it
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| trend for atomic size | atoms get smaller as you move across a period and larger as you move down a group
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| trend for ionization energy | first ionization energy increases as you move across a period and decreases as you go move down a group
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| trend for electron affinity | the amount of energy released when an atom acquires an electron and forms a negative ion; increases as you move across a period and decreases as you move down a group
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
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To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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