Chem 142 UW Exam 1 Latest Version Already Passed

Chem 142 UW Exam 1 Latest Version Already Passed The atom Consists of a small nucleus with a positive charge containing most of the weight. Has an electron cloud with mostly empty space but some electrons as well Protons The chemical identity of the element Electrons Ionic character of atom Neutrons Isotopic character of the atom Atomic number (Above element on PT) represents... Number of protons Mass number represents... Sum of protons and neutrons Atomic mass (Under element on PT) represents... An average of the atomic masses of common isotopes Isotope An elements with the same number of protons but different neurons and therefore different atomic masses (12^C, 13^C, 14^C) Anions _____ electrons, giving them a ____ charge Gain, Negative Cations _____ electrons, giving them a _____ charge Lose, Positive T or F? Chemical reactions do not change elements True, except with nuclear reactions T or F? Atoms of each element have the same number of protons True. Isotopes of an element have a different amount of neutrons Properties of a Metal (4 total) 1) Conduct heat/electricity 2) Malleable 3) Ductile 4) Tend to lose electrons (+ charge) Properties of Nonmetals (3 total) 1) Dull/brittle 2)Nonconductor 3) Gain electrons (-charge) Properties of Semimetals Have properties of both nonmetals and metals Groups move.... across the periodic table Periods move... up and down the periodic table Group 1A Alkaline metals