Question

An element X(atomic no 17) reacts with an element Y(atomic number20) to form a compound. a) write the position of these elements in the modern periodic table. b) write the formula of the compound formed. Justify your answer in each case

Answer 1

A. Element X is positioned in period 3, group 17

And element Y is in period 4, group 2.

B. Electronic configuration of X is (2, 8, 7) and so we can tell that it’s valency is - 1.

Valency of element Y (2, 8, 8, 2) is +2.

So the formula of the compound is : YX2

Answer 2

x is chlorine and its valency is 1

y is calcium its valency is 2

a)x group no is 1 and it is in the period 3

y group no is 2 and period no is 4

b)X2Y

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