Look at the Periodic Table in Figure 10.2.

Figure 10.2

a. Which element is found in Period 4, Group 17?

b. The relative atomic masses of tellurium (Te) and iodine (I) are 128 and 127, respectively. Why did this present a problem to Mendeleev when he was constructing his Periodic Table?

c. Why are the elements in Groups 1 and 2 known as s-block elements, whereas those in Group 17 are p-block elements?

Transcribed Image Text:

Group 9. 1 2 3 6. 7 8. 10 11 12 13 14 15 16 17 18 Period 2 Не hydrogen helium key 1.0 4.0 3 atomic number 9 10 2 Li Be atomic symbol B F. Ne ithium berylium boron carban nitrogen fluorine name arygen neon 6.9 9.0 relative atomic mass 10.8 12.0 14.0 16.0 19.0 20.2 11 12 13 14 15 17 18 3 Na Mg Al Si Ar sodum magnesium aluminium slicon phosphorus sullur chlerine argen 23.0 24.3 27.0 28.1 31.0 32.1 35.5 39.9 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 4 K Sc Mn Co Ni Cu Zn Ga Ge As Br Kr calcium scandium titanium vanadium chromium manganese iron cobalt nickel capper zine galium germanium arsenic selenium bramine kryptan 83.8 potassium 39.1 40.1 45.0 47.9 50.9 52.0 54.9 55.8 58.9 58.7 63.5 65.4 69.7 72.6 74.9 79.0 79.9 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 Rb Nb Mo To Ru Pd Ag Cd Sn Sb Te Хе rubidum zrconium molyacenan techneium ruthenium 95.9 strontium yttrium nisbium rhodium peladium slver cadmiam indium in antimeny tellurium iodine Xenon 85.5 87.6 88.9 91.2 92.9 101.1 102.9 106.4 114.8 118.7 121.8 127.6 126.9 131.3 55 56 57-71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 6. Cs Ba lanthanoids Hf Re Au Hg Pb Rn caesium barium hafnium tantalum tungsten rhenium Osmium iridium platinum gold mercury thallum lead bismuth polonium astatine radon 132.9 1373 178.5 180,9 183.8 186.2 190.2 192.2 195.1 197.0 200.6 204.4 207.2 209.0 87 88 89-103 104 105 106 107 103 109 110 111 112 114 116 Fr Ra Db Sg Bh Hs Rg meitnerium darmotadium roenigenium copemicam actinoids Mt Ds Cn FI Lv francium Tedium rutherlardium dubnium seaborgium bohrium hassium flerovium livermorium 57 58 59 60 61 62 63 54 65 66 67 68 69 70 71 La Ce Pr Nd Pm Sm Er Eu Gd europium gadolinium Tb Dy dysprosium lanthanoids Но Tm Yb Lu lanthanum priseadymiam neadymium promethium samarium 144.4 cerium terbium holmium erbium thulum yllerbium luletium 138.9 140.1 140.9 150.4 152.0 157.3 158.9 162.5 164.9 167.3 168.9 173.1 175.0 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 Th Np neptunium plutonium Cm Bk Es californium einsteinium actinoids Ac Pa Pu Am Fm Md No Lr actinium tharium protacinium uranium americium curium berkelium fermium mendeievium nebelium lawrencium 232.0 231.0 238.0 O P. co