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ICSE Class 10 Chemistry Question 5 of 23

Model Paper 3 — Question 1

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Question

Question 3(i)

(a) State the type of bonding of the oxide of the element 'A' having electronic configuration 2, 8, 8. 1.

(b) Write the formula of the oxide of A.

Answer

(a) Element A has electronic configuration of 2, 8, 8, 1, its atomic number is 19. Thus, element A will be potassium (K), and potassium is a metal, whereas oxygen is a non-metal, so the bonding in its oxide will be ionic bond.

(b) A has valency of = 1

Oxygen (O) has valency = 2

So, two A atoms combine with one O atom to form A2O.