The position of three elements A, B and C in the Periodic Table is shown
below:
Group 16
Group 17
A
C С
B
Giving reasons, explain the following:
(a) Element A is a non-metal.
(b) Element B has a larger atomic size than element C.
(c) Element C has a valency of 1
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Answer:
(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) Element C has 7 valence electrons, it can gain 1 electron to become stable so its valency is 1.
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