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Chem 120 Exam 1 Questions and Answers .

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Chem 120 Exam 1 Questions and Answers .

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Chem 120 Exam 1 Questions and Answers

atomic mass unit (amu) - ANS-half the mass of a carbon atom containing 6 protons and
6 neutrons

atomic number (Z) - ANS-the number of protons in an atom's nucleus

chemical symbol - ANS-a unique one or two letter abbreviation of an element

isotope - ANS-atoms with the same number of protons , but a different number of
neutrons

mass number (A) - ANS-the sum of the number of protons plus neutrons in an atom

ion - ANS-charged particles - occur when an atom gains or loses electrons anion -

ANS-negatively charged ions

cation - ANS-positively charged ions

periodic law - ANS-when the elements are arranged in order of increasing mass, certain
sets of properties recur periodically

metals - ANS-(lower left and middle table) good conductors of heat and electricity,
malleable, ductile, often shiny, and tend to lose electrons

nonmetals - ANS-(upper right of table) some are liquid at room temperature, others are
liquids or gases, tend to be poor conductor and gain electrons

main-group elements - ANS-properties are largely predictable based on their position in
table

group - ANS-columns within the main-group regions of the table

noble gases - ANS-group VIIIA, unreactive

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