Question

three elements a, b, c are placed in group 17 of mordern periodic table . i) A is a non metal ii) element c has valency 1​

Answer 1

Answer:

Explanation:

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.