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 * ques 6-13 p12**


 * 6** The rows in the periodic table are called periods.
 * 7** Groups are the vertical columns in the periodic table.
 * 8** Three special blocks with no normal group numbers are the transition elements, the lanthanides and the actinides.
 * 9** There are far more metals than non-metals in the periodic table.
 * 10** The metalloids are: boron, silicon, germanium, arsenic, antinomy, tellurium, polonium and astatine.
 * 11** The non-metals are: H, He, C, N, O, F, Ne, P, S, Cl, Ar, Se, Br, Kr, I, Xe and Rn.
 * 12** Examples might be: iron, gold, copper, silver, zinc, mercury and platinum.
 * 13 a** False: Horizontal rows in the periodic table are periods.
 * b** False: Vertical columns are called groups.
 * c** False: The most reactive metallic atom would be francium Fr.
 * d** True: The most reactive non-metallic atom would be fluorine F.
 * e** True: The transition elements are all metals

Answers 1.2. > b 79 c 8 d 12 e 98 f 35 g 36 6 a 7 8 Carbon, chlorine, cobalt, copper, chromium, calcium, cesium, cerium, californium > with one letter. Elements in the same group share common properties.
 * 1) Diagrammatic answer required.
 * 2) 2 Group VIII
 * 3) 3 Halogens
 * 4) 4 a 78
 * 1) b C, Cl, Co, Cu, Cr, Ca, Cs, Ce, Cf
 * 2) c All elements must have a unique symbol. Therefore, only one ‘c’ element can start

It tells us the number of protons that are in the nucleus of the element. Rutherfordium—Rutherford; Bohrium—Niels Bohr; Curium—Curie; Einsteinium—Einstein; Fermium—Fermi; Mendeleevium—Mendeleev; Nobelium—Nobel; Seaborgium—Seaborg; Lawrencium—Ernest Lawrence (inventor of the cyclotron) 5 a Carbon

b Lithium 9 c Zirconium

d Aluminium

e Uranium

f Barium

g Hydrogen