ACS Chemistry Final Exam (with Complete Solutions)

atomic number = correct answers # of protons mass number = correct answers # of protons + neutrons the number of protons in a neutral atom will equal the correct answers # of electrons how to find the correct number of neutrons correct answers mass number - atomic number Forms of the same elements that differ in amount of neutrons correct answers isotopes What particle, if lost from the nucleus, would NOT cause a change in the atomic number? correct answers a neutron because it has no charge When alpha particles were shot at a metal foil target, most passed through without deflections, while others deflected at large angles. What did this suggest to Rutherford? correct answers that the atoms of the metal were mostly empty space, while the nucleus consisted of most of the mass which included highly condensed positive particles (which caused the deflection). An atom has a valence shell configuration of 1s1. To which group of elements on the periodic table does it belong? correct answers IA alkali metals electromagnetic spectrum correct answers The greater the wavelength of a photon..? correct answers the lower its frequency The greater the frequency of a photon...? correct answers the shorter its wavelength Light energy formula correct answers What does C in the light energy formula represent? correct answers Give the ground-state electron configuration of an atom in the second period correct answers 1s2 2s1 Electrons configuration rule that states electrons do not pair until they have to. (put one electrons in each electron domain then pair up) correct answers Hund's rule An experimental phenomena associated with atoms having unpaired electrons - which states such substances are attracted to magnetic fields correct answers Paramagnetism Which drop in energy level results in the greatest emission of energy? correct answers n=2 to n=1