1) What is the mass and charge of a proton? a) 1 amu, positive b) 1 amu, neutral c) 1 amu, negative d) 0 amu, neutral 2) What subatomic particles are found in the nucleus? a) protons and electrons b) protons only c) protons and neutrons d) electrons only e) neutrons only 3) According to the electron-cloud model of the atom, an orbital is a a) circular path traveled by an proton around the nucleus b) spiral path traveled by a neutron c) region of the most probable proton location d) region of the most probable electron location 4) What can be determined if only the atomic number of an atom is known? a) the total number of neutrons, only b) the total number of protons , only c) the total number of protons and the total number of neutrons d) the total number of protons and the total number of electrons 5) Which particle has a mass that is approximately the same as the mass of a proton? a) electron b) neutron c) both electrons and nuetrons d) no particle has a similar mass as a proton 6) An atom is electrically neutral because the a) number of protons equals the number of electrons b) number of protons equals the number of neutrons c) nucleus is positive and electron cloud is negative d) neutrons balance the electrons and protons 7) For hydrogen atom with a mass of 1, which of the following statements is true? a) there are no electrons or neutrons b) there are no protons or electrons c) there are no neutrons d) there are no electrons 8) Experimental evidence indicates that the nucleus of an atom a) has a negative charge b) contains most of the mass of the atom c) has no charge d) contains a small percentage of the mass of the atom 9) Which of these describes the nucleus of an atom? a) small b) large c) positively charged d) holds the mass of the atom e) contains protons and neutrons f) contain neutrons and electrons 10) Which particle has the least mass? a) a neutron b) a proton c) an electron 11) What particle has a mass of approximately one atomic mass unit and a positive charge? a) a neutron b) the nucleus c) a proton d) an electron 12) What particle is electrically neutral? a) a neutron b) electron c) a proton 13) Particle that has a mass of 1 amu is -- a) proton b) neutron c) electron 14) What is the nuclear charge of an atom with a mass of 23 and an atomic number of 11 ? a) 34+ b) 23+ c) 12+ d) 11+ 15) Which of the following describes an electron? a) positive b) negative c) 0amu d) 1amu e) located in nucleus f) located outside nucleus 16) Which of the following describes an proton? a) positive b) negative c) neutral d) 1amu e) located in nucleus f) 0 amu 17) Which of the following describes an neutron? a) positive b) negative c) neutral d) 1amu e) located in nucleus f) 0 amu

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