Question

Problem Set 4 Atomic Structure and the Periodic Table Name: Date: Lab Section: General Instructions Complete the following problems. Attach another sheet to give yourself space for problems 8,9,10 as needed. Assignment is due at the end of the lab period unless stated otherwise by instructor. 1.) Energy Levels and Sublevels for the Polyelectronic Atom (a) How many sublevels exist in the energy level (n = 5)? (b) How many orbitals exist in any f-sublevel? (c) What is the maximum number of electrons that the energy level (n-4) can hold? (d) State the values of the four quantum numbers associated with an electron in a 4s orbital. 2.) Bohr Model for the Hydrogen Atom The energy levels available to the electron in hydrogen are given by the following equation: E-- where, R.- 2.179 x 10-J and n=1,2,..., (6) Calculate the difference in energy (in J) between an electron in n1 and an electron in n-3 (b) What would be the wavelength (in nm) of the radiation responsible for promotion of an electron from n-1 ton 3? (c) Would you be able to see the light emitted from a collection of atoms whose electrons fall from n=3 to n=1? If not, why? 3.) Electron Configuration: Supply the ground state electron configurations for neutral atoms of the following elements. You may use the short-hand notation (e.g. Li: [He]2s!). (a) N (b) Na (e) Ca (d) Sc (e) Sn (1) At_ 4.) Periodic Trends: Arrange the following sets of neutral atoms in order of increasing atomic radius. (e.g. Li Na<K) (a) Sr, Mg, Be Se Me Be (b) B.N.C (e) Cs, Rb, Na_ (d) F, I, Br (e) CI, SP (10, S. Se

Answer 1

(a) For 5th Ene e 5th Energy level (n = 5) will be 25. ble values a t=0,1,2,3,4 and are connesponds The possible values g I=0, to s, p,d, J and g arbitals. S has 1 subshell P has 3 Subshell D has 5 Subshell F has 7 subshell G has a subshell D 'F'Mas 7 Orbitals that can hold upto 14 electrons. © The Maximum nuber of electrons any energy level can hold 18 - Electron capacity = 2n2 n = 4 Electron capacity = 32 45 n = 4 [L=0 because for s, l=0 Pl=1 d, L=2 d l=3 L to th m = [m=0