Question

The position of three elements A, B and C in the periodic table is shown below :
Give reason, explain the following:
a) Element A is a non-metal
b) Element B has larger atomic size than element C
c) Element C has a valency of 1​

Answer 1

Answer:

(a) A is a non-metal because it can gain electrons easily, it has 7 valence electrons and form 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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