[IMAGE] Where a, b, c, d, e, f, g, h are 3rd period elements. If difference
between atomic number of elements b and e is x and difference between
atomic number of elements c and f is y. What is the value of x - y.

Show answer and solution

a is Na, b is Mg, c is Al, d is Si, e is P, f is S, g is Cl, h
is Ar,
x = 3, y = 3
x - y = 0

Source: Grass-G / CH-23 Chemistry Paper 31 Dec. FST.docx

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