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The atomic number of an element is the toal number of which particles in the nucleus? a) neutrons b) protons c) electrons d) protons and electrons {Ans: b) protons}The mass number of an element is equal to ______. a) the total number of electrons in the nucleus b) the total number of protons and neutrons in the nucleus c) less than twice the atomic number d) a constant number for the lighter elements {Ans: b) the total number of protons and neutrons in the nucleus}Whcih discovery did J.J. Thomson make that improved upon Dalton's atomic theory? a) Atoms contain tiny, negatiely charged electrons b) Atoms are always in motion c) Atoms contian a tiny, positivey charged nucleus d) Atoms that ocmbine do so in siple whole-number ratio {Ans: a) Atoms contain negatively charged electrons}Who conducted expriments to determine the quanity of charge carried by an electron? a) Rutherford b) Millikan c) Dalton d) Thomson {Ans: b) Millikan}Which of the following is true about subatomic particles? a) Electrons are negatively charged and are the heaviest subatomic particle b) Proton are positively charged and the lightest subatomic particle c) Neutrons have no charge and are the lightest subatomic