CHEM1201 Lecture 5: Week 4 lecture 2

Na reacts with element X to from an ionic compound with the formula Na_3X. Ca will react with x to form ___. A) Ca3X B) Ca X C) Ca_3 X_2 D) Ca_2 X_3 E) Ca X_2 Which two bonds are least similar in polarity? A) 1-Br and Si-CI B) B-F and CI-F C) Ai-CI and I_Br D) O-F and CI-F E) C-CI and Ge-CI Based on the octet rule, phosphorus most likely forms a ___ ion. A) p^5- B) p^3- C) P^+ D) P^5+ E) P^3+ The complete electron configuration of krypton, element 36, is ____. A) 1s^2 2s^2 2p^6 3p^6 4s^2 3s^10 4p^6 B) 1s^4 2s^4 2p^8 3s^8 4s^4 3s^4 C) 1s^42 s^4 2p^6 3s^4 3p^6 4s^4 3s^8 D) 1s^4 2s^4 2p^10 3s^4 3p^10 4s^4 E) 1s^2 2s^2 3p^10 3s^2 3p^10 4s^2 3d^8 a tin atom has 50 electrons. Electrons in the ___ subshell experience the lowest effective nuclear charge. A) 1s B) 5s C) 5p D) 3p E) 3d Which equation correctly represents the electron affinity of calcium? A) Ca^+ (g) + e^- rightarrow Ca (g) B) Ca(g) rightarrow Ca^-(g) + e^- C) Ca(g) + e^- rightarrow Ca^-(g) D) Ca^-(g) rightarrow Ca(g) + e^- E) Ca(g) rightarrow Ca^+(g) + e^- Of the atoms below, ____ is the most electronegative. A) N B) Si C) C D) As The angular momentum quantum number for the outermost electrons in a boron ground state ___. A) -1 B) 1 C) 3 D) 2

All of the following orbital representations are allowed except 7s 3d 1p 4f 3p Which of the following sets of the four quantum numbers n, l, m and s describe one of the outermost electrons in a ground-state radium atom? 6, 1, 1, 1/2 7, 0, 1, -1/2 7, 0, 0, -1/2 7, 1/2 7, 2, 1, -1/2 Electron configurations The electron configuration for Cr^2+ is [Ar] 4S^2 3d^4 [Ar] 4s^1 3d^5 [Ar] 3d^4 [Ar] 4s^2 3d^2 none of these Which pair of species is iselectronic? K^+ and Ar Na^+ and K^+ F' and Cl^- B^3+ and Ne Be^2+ and Na^+ Which of the following have a total of 10 electrons in the d orbital's? Mn Fe Cu Zn tow of the above What doubly positive ion has the ground-state electron configuration 1s^2 2s^2 2p^6 3s^2 3p^6 3d^10? Ni^2+ Zn^2+ Cd^2+ Ca^2+ Sr^2+