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27 Cards in this Set
- Front
- Back
Which subatomic particles have a mass of approximately 1 atomic mass unit each?
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Protons and Neutrons
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What happens when you go down the periodic table?
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Valence Electrons go up
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The major portion of an atoms mass consists of ?
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Neutrons and Protons
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Which of the group 17 elements listed below has the greatest nuclear charge
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I ( Iodine )
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The mass of 12 protons is approximately equal to
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12 atomic mass units
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As the number of neutrons in the nucleus of a given atom of an element increases, the atomic number of that element
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Remains the same
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Which statement is true about a proton and an electron
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They have different masses and different charges
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When the electrons of an excited atom return to a lower energy state, the energy emitted can result in the production of
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Spectra
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Which substance can be decomposed a by a chemical change
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CO
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Matter that is composed of two or more different elements chemically combined in a fixed proportion is classified as
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a Compound
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Which list consists of elements that have the most similar chemical properties?
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Mg,Ca,and Ba
Magnesium ,Calcium ,Barium |
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Which element is classified as a noble gas at STP
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Neon
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Which group contain elements in three phases of matter at STP
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Group 17
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Which gaseous element has the greatest density at STP
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Cl2
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Which element can for more than one binary compound with chlorine?
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Fe
( Iron ) |
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Tetra chloromethane , CCL4, is classified as a
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Compound because the atoms of the elements are combined as a fixed proportion
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Two substances, A and Z are to be identified. Substance A can not be broken down by a chemical change. What can be concluded about these substances
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Both substances are elements
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All atoms in a given sample of an element contain the same number of
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Protons and Electrons
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Which statement best describes Group 2 elements as they are considered in order from top to bottom of the Periodic Table?
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The number of principal energy levels increases and the number of valence electrons remains the same
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Group 1
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Alkali Metals
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Group 2
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Alkaline Earth Metals
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Group 3-12
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Transition Metals
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Group 17
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Halogens
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Group 18
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Noble Gases
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What is an element
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An element is a substance consisting of atoms which all have the same number of protons
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What is a Solution
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Mixture of a solid and a liquid where the solid never settles out, etc. saltwater.
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What is a Mixture
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mixture contains two or more substances that are not chemically combined.
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