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22 Cards in this Set
- Front
- Back
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a capital letter or a combination of a capital letter and a small letter that is used to represent an element is a?
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Chemical Symbol
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the horizontal rows of elements?
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periods
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an average of the masses of all the isotopes that occur in nature for element is the?
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avergae atomic mass
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vertical columns are called?
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groups
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elements in the middle of the periodic talbe, groups 4-7n are called?
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transition elements
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the number of protons in an atom is the?
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atomic number
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protons and neutrons can be subdivided into __ by colliding them.
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quarks
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the center of an atomwhere protons and neutrons are located is the?
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nucleus
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a total count of the neutrons and protons in an atom is the?
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mass number
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atoms of the same element but with different numbers of neutrons are?
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isotopes
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elements that are found on the left side of the periodic table are?
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metals
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elements that have some properties of both metals and nonmetals are?
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metalloids
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the particles that move about the nucleus and have negative charge?
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electrons
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the region around the nucleus occupied by electrons is an?
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electron cloud
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a chart that shows the classification of elements is?
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periodic table
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why are noble gases stable?
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because they have a full outer shell
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how are isotopes same?
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they have the same atoms of the same element
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how are isotopes different?
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they have different number of neutrons
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what do the elements in the same group have in common?
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they have the same number of electrons in their outer energy level
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what do the elements in the same period have in common?
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they have a different number of neutrons
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list the subartic particles tell their charge and when they are located?
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neutron-neutreal, in the nucleus
electron-negative, electron cloud proton- positive, nucleus |
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list the properties of metals and nonmetals
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metals-on the leftside, soild at room temperature,and shiny
nonmetals-on the right,gases, brittles, and poor conductors of electricity. |
