The position of three elements A,B and C in the periodic table are shown below: [5 MARKS]
(a) State whether A is a metal or non-metals.
(b) Will C be larger or smaller in size than B?
(C) State whether C is more reactive or less reactive than A.
(d) Which type of ion, cation, or anion will be formed by element A?
(e) Give two examples of group 17.
(a) A is a non-metal because it can gain electrons easily, it has 7 valence electrons and forms negative ions to become stable.
(b) The atomic number of B is less than C, it has less nuclear charge, less force of attraction between protons in the nucleus and valence electrons, hence its size is bigger than C.
(c) A is more reactive due to its small size and has more tendency to accept outside electrons, hence A is more reactive than C.
(d) Anion will be formed due to the tendency to accept electrons.
(e) Chlorine and bromine.