Name IL Date Mr. Tauriello / Atomic Structure Use your knowledge about bright-line spectra and atomic structure to complete the questions below. 1. Explain in terms of protons and neutrons, why U-235 and U-238 are different isotopes of uranium. / Base your answers to questions 2 through 4 on the information below. The bright-line spectra for three elements and a mixture of elements are shown below. BrighHJne! Spectra U .„,— H H© Ma UBkn ™n ([) j y G) (j) (b SHE t IE mi 5) m m 2. Explain in terms of both electrons and energy, how the bright-line spectrum of an element is produced. L)kM Art tlnbro/l durk §$>m Mou/i-f d ttAemil (jjMrtflAMJ it jwnjti ^ (k hi&htrUliryj ItPii ant//'S tA ^C liS\ thlolt Mv* mikd Mr iht tlidrm rilmi\ Hit's (XQJS iJ[vk\l ^ Oi ItyMphofan oh*/i si Mi fa rte mrt tMlttymd. 3. Identify all the elements in the mixture: fffL. rf 4. State the total number of valence electrons in a cadmium atom in the ground state, j kOD f 6A f i f ^lodiC 'JiMt / C^MlllM / j d- l-l-H-ft]!! 2V<ACt titers Base your answers to questions 5 and 6 on the information below. Element X y z Electron Configuration 2-8-8-2 2-8-7-3 2-8-8 5. What is the total number of valence electrons in an atom of electron configuration X? ^ 6. Which electron configuration represents the excited state of a (^ 6 l U ' ^-^ calcium atom? j £t f&v^G ^ W ^ Base your answers to questions 7 through 9 on the information below. Isotope 20 Ne Ne 22 Ne 21 Atomic Mass (atomic mass units) 19.99 20.99 21.99 Percent Natural Abundance 90.9% 0.3% 8.8% 7. I n terms of atomic particles, state one difference three isotopes of neonT /III •mrtt HtyhjKj ftf /lecii between these Luf/iffffM-f-/IUM^Z-J tP /Ifufm/K. 8. Show a correct numerical setup f o r calculating the average atomic mass of neon. 9. Based on the natural abundances, the average atomic mass of neon is closest to which whole number? eJO Z(>
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