Select the group of the periodic table containing some elements with a condensed electron configuration of [X]ns2(n-1)dnp. Period Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display MAIN-GROUP ELEMENTS Metals (main-group) Metals (transition) MAIN-GROUP ELEMENTS Metals (inner transition). - 1A (1) 1 H 2A 1.008 (2) 3 4 2 LI Be Metalloids Nonmetals 8A (18) 2 ЗА 4A 5A 6A 7A He (13) (14) (15) (16) (17) 4.003 5 6 7 8 9 10 B C N F Ne 6.941 9.012 10.81 12.01 14.01 16.00 19.00 20.18 11 12 TRANSITION ELEMENTS 13 14 15 16 " w 3 Na Mg 38 4B 5B 68 7B 8B- 1B 2B AI Si P S 22.99 24.31 (3) (4) (5) (6) (7) (8) (9) (10) (11) 19 20 21 22 23 24 25 26 27 28 29 (12) 26.98 31 28.09 30.97 32.07 17 18 CI Ar 35.45 39.95 K Ca Sc Ti V Cr Mn Fe Co Ni 37 38 40 41 42 Zr Nb Mo 95.94 55 56 57 6 Cs Ba La 73 74 W 183.9 104 105 106 7 39.10 40.08 44.96 47.88 50.94 52.00 54.94 55.85 39 5 Rb Sr Y 85.47 87.62 88.91 91.22 92.91 72 Hf Ta 132.9 137.3 138.9 178.5 180.9 87 88 89 Fr Ra Ac Rf Db Sg (223) (226) (227) (263) (262) (266) (267) (277) (268) (281) 272) (285) 58.93 58.69 43 Tc (98) 44 45 46 Ru Rh Pd 101.1 102.9 106.4 47 48 49 75 76 77 78 79 Re Os Ir Pt Au 186.2 190.2 192.2 195.1 82 Hg TI Pb 97.0 200.6 204.4 207.2 209.0 107 108 109 110 111 112 Bh Hs Mt Ds Ag Cd In 07.9 112.4 114.8 80 30 32 33 34 35 36 Cu Zn Ga Ge As Se Br Kr 3.55 65.41 69.72 72.61 74.92 78.96 79.90 83.80 50 51 52 53 Sn Sb Te 1 Xe 118.7 121.8 127.6 126.9 131.3 54 81 83 Bi 84 85 86 Po At Rn (209) (210) (222) 114 116 (289) (292) INNER TRANSITION ELEMENTS 58 6 Lanthanides Ce 7 Actinides 59 60 61 Pr Nd Pm 140.1 140.9 144.2 (145) 90 91 92 93 Th Pa U Np 232.0 (231) 238.0 (237) 98 62 63 64 65 66 67 69 70 Sm Gd Tb Dy Ho Er Tm Yb Lu 150.4 152.0 157.3 158.9 162.5 164.9 167.3 168.9 173.0 175.0 94 95 96 97 99 100 101 102 103 Pu Am Cm Bk Cf Es Fm Md No Lr (242) (243) (247) (247) (251) (252) (257) (258) (259) (260) 68 71

1- Write the empirical formula for at least four ionic compounds that could be formed from the following ions: MnO4-,  NH+4, PO3-4, Fe2+   2-Write the ground-state electron configuration for a neutral atom of each element: chromium   manganese   3-A robot spacecraft returned samples from the planetesimal 98765 ALEKS, located in the outer Solar System. The mass-spectroscopic analysis produced the following data on the isotopes of ruthenium in these samples: isotope mass(amu) relativeabundance 102Ru 101.90 90.3% 104Ru 103.91 9.7% Use these measurements to complete the entry for ruthenium in the Periodic Table that would be used on 98765 ALEKS. Be sure your answers have the correct number of significant digits. Caution: your correct answer will have the same format but not necessarily the same numbers as the entry for ruthenium in the Periodic Table we use here on Earth.   Ru     4-Complete the following…

Each of the following sets contains isoelectronic ions (ions containing the same number of electrons). Select the set that shows the correct trend in increasing size or increasing ionic radius.           (A) O2– < F– < Na+ < Mg2+ ;                                (B) F– < O2– < Mg2+ < Na+;           (C) Mg2+ < Na+ < F– < O2–;           (D) Mg2+ < Na+ < F– < O2–;

4. Which of the following has (have) the same electron configuration (isoelectronic) as F? Na+ Ca²+ p3- Ne Mg²+ A