an element X atomic number 17 reacts with an element Y atomic number 22 from 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.
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A has electronic configuration - 2,8,7.
It has 3 shells or orbits so it is placed in period 3.
It has 7 electrons in the outermost shell it is placed in groupVII A
B has electronic configuration - 2,8,8,1.
It Has 4 shells or orbits so it is placed in period 4
It Has 1 electron in its outermost shell so it is placed in group I A
A is Cl 1- And B is K 1+
2K + Cl ⇒ 2 KCl
²
Since it Is Giving And Taking Of Electrons bond present between them is ionic bond.
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