Electron Configuration and Periodic Properties Lab Report Sheet Answers

Electron Configuration and Periodic Properties — Lab 7 Report SheetPre-lab1. Why does a sodium street lamp emit yellow light while a neon light emits red light?2. Describe electron energy levels.3. Why do some elements produce colorful flames?4. How can a flame test identify an unknown element?5. Write the electron configurations of lithium, sodium, and potassium.6. Why do those three configurations end with the same sublevel pattern?A. Flame testsRecord the flame colors of CaCl2, KCl, BaCl2, SrCl2, CuCl2, and NaCl. Record the unknown letter, observed flame color, and element identified. Explain why salted spaghetti water boiling into a gas flame can make the flame bright orange.B. Electron configurationsFor O, Na, Ca, Fe, Zn, Br, Sr, Cd, Xe, Cs, Pb, and Ra, give the electron configuration, number of valence electrons, and group number.Complete the following:- number of sublevels in n = 3; group number of carbon;- number of orbitals in 2p; sublevel being filled at atomic number 47;- maximum electrons in 3d; sublevel beginning after 4s2;- maximum electrons in one 3p orbital; valence electrons in As.Identify the element symbol for:- the first element filling 3s;- the first element with five 3p electrons;- the period 4 element in fluorine's group;- [Ar] 3d10 4s2 4p3;- the element with 3d6;- the first element completing n = 3;- the element with a half-filled 5p sublevel;- the period 6 element in magnesium's group.C. Atomic radiusPlot the supplied atomic radii for atomic numbers 1–25. Describe the period 2 trend from Li to Ne and explain why period 3 from Na to Ar follows a similar pattern.