With the exception of helium, the noble gases condense to form solids when they are cooled sufficiently. At temperatures below 83 K, argon forms a close-packed solid whose structure is shown below.

(a) What is the apparent radius of an argon atom in solid argon, assuming the atoms touch as shown in this figure? 

(b) Is this value larger or smaller than the bonding atomic radius estimated for argon in Figure 7.7? 

(c) Based on this comparison would you say that the atoms are held together by chemical bonds in solid argon?

Figure 7.7

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Go Figure which part of the periodic table (top/bottom, left/right) has the elements with the largest atoms? 1A K 2.03 Rb 2.20 Li Na 1.66 E 1.28 A Mg H 0.31 1.41 Be 0.96 2A Sc Ti Cr Mn Zn Ga Ge As AL Si 1.21 1.11 1.07 P V Fe Co Ni Cu 1.76 1.70 1.60 1.53 139 139 132 1.26 1.24 1.32 1.22 1.22 1.20 1.19 1.20 1.20 1.16 01.53/19 Se Br Kr Sr Y Zx Tc Ru Nb Mo Rh Pd Ag Cd In Sn Sb Te 1.95 1.90 1.75 1.64 1.54 147 146 1.42 1.39145 144 142 1.39 1.39 1.38 1.39 1.40 1 Xe Increasing radius 3A 4A 5A 6A ▲ Figure 7.7 Trends in bonding atomic radii for periods 1 through 5. 7A 8A O B N 0.84 0.76 0.71 0.66 He 0.28 F Ne 0.57 0.58 1.05 1.02 1.06 S a Ar Increasing radius Radius (Å)