(a) The table below compares some properties of metals and non-metals. Write down the missing statements (i) to (iv): MetalsNon−metals(i)……Poorconductorsofheat(ii)Malleable……(iii)Formpositiveions……(iv)……Formacidicoxides
(b) How many valence electrons are present in: 1. Metals 2. Non - metals [5 MARKS]
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Solution
a) 4 Marks b) 1 Mark
(a) (i) Goods conductors of heat. (ii) Brittle (iii) Form negative ions (iv) Form basic oxides
(b) 1. Metals usually have 1, 2 or 3 valence electrons 2. Non - metals usually have 5, 6 or 7 valence electrons.