(A) Refer only to the periodic table on the inside front cover, and arrange the following species in order of increasing size: Ti²⁺, V³⁺, Ca²⁺, Br^-, and Sr²⁺.

(B) Refer only to the periodic table on the inside front cover, and determine which species is in the middle position when the following five are ranked according to size: the atoms N, Cs, and As and the ions Mg²⁺ and Br^-.

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REIHEN 3 A W 1 2 Li=7 4 K 56 94 Gruppe 1 Gruppe 11 Gruppe III Gruppe IV Gruppe V Gruppe VI Gruppe VII RH²³ 3 2.5 R²3 7 9 10 12 M 6 Rb 85 R²0 - H=1 - 8 Cs 133 (-) (Au=199) (Cu=63) Na:23 =39 Ca=40 (Ag=108) - RO Be=94 Mg:24 Cd: 112 B =11 Ba=137 - Al: 273 Zn: 65 Sr=87 ?Yt=88 =44 -=68 RH RO² Di=138 C =12 Si: 28 Ti=48 N=14 P= 31 V = 51 Hg:200 Ti=204 Pb:207 Th=231 -= 72 Zr=90 Nb=94 As: 75 In = 113 Sn: 118 Sb: 122 ?Ce=140 RH² 2 RO³ Bi-208 O=16 S= 32 Cr=52 Se=78 Mo=96 Er=178 ?La-180 Ta=182 W =184 Te = 125 L U =240 RH R²O7 F =19 CI=355 Mr-55 Br=80 - =100 J=127 Gruppe VIII Fe=56, RO4 Ni:59 Co=59 Cu:63 Ru=104, Rh=104 Pd=106, Ag:108 Os=195, Ir =197 Pt: 198, Au 199