If an element X with atomic number 13 combines with an element Y whose atomic number is 8; the most likely formula of the compound formed between X and Y is

 

If an element X with atomic number 13 combines with an element Y whose atomic number is 8; the most likely formula of the compound formed between X and Y is

A. XY

B. X2Y

C. XY2

D. X3Y2

E. X2Y3

The correct answer is E. X2Y3 

Explanation: You can use the quantum number methods

X=13

   =2,8,3

X outermost electron is 3.

Y=8

   =2,6 

Y need two electron to reach octet electronic configuration of a noble gas. So the combining power is 2. i.e. (2+6=8)

The combination is as follows

X                           Y

3                            2

During combination there is exchange of radicals.

So we now have X2Y3

We makes option E. the chosen one.

QUESTION SOURCE: 2001 NECO OBJECTIVE QUESTION 42.

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