Question

An element X from group 2 reacts with element Y from group 17 to form a compound.(a) What is the nature and formulae of the compound?(b) State whether this compound conducts electricity or not?(c) What is the valency of X and Y?(d) How many valence electrons are there in X and Y?

Answer 1

Let X be magnesium and Y be Chlorine.
So its nature is neutral as it is a electrovalent bonded salt.
Its formula XY2.
Valency of X and Y is 2 and 1 respectively.
Valence electrons in X is 2 whereas in Y it is 7.
It will conduct electricity also.


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Answer 2

Element X being in group 2 has 2 electrons in the outermost energy levels and hence react by losing the two electrons.

Element Y is in group 17 reacts by gaining 1 electron in the outermost energy level.

Their ionic formulas are as follows:

X²⁺

Y⁻¹

a) The compound formed when the two react is :

XY₂

This compound is an ionic compound since the reaction is between a metal and a non-metal.

b) Ionic substances conduct electricity when in solution form so the substance conducts electricity when in solution form.

c) The valence of an element is the number of electrons in the outermost energy level of the element therefore the valences are:

X = 2

Y = 17

d) X = 2 electrons

Y = 17 electrons.