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.
  1. Diagrammatic answer required.
  2. 2 Group VIII
  3. 3 Halogens
  4. 4 a 78
    b 79 c 8 d 12 e 98 f 35 g 36
6 a
Carbon, chlorine, cobalt, copper, chromium, calcium, cesium, cerium, californium
  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
    with one letter.
Elements in the same group share common properties.

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