Sometimes, based on the electron configurations of the elements involved, a possible chemical formula for a compound can be predicted. Elements A ([core]ns2) and B ([core]ns2np5) react to form ionic compound AxBy. Select the false statement below:

A) element A serves as the reducing agent in the reaction to form AxBy

B) the x and y in AxBy must reflect the lowest whole number ratio of moles of A to moles of B

C) x + y = 3

D) the first ionization energy (IE1) of B is most probably lower than the first ionization energy (IE1) of A

E) the B in AxBy has a - 1 oxidation state

D) the first ionization energy (IE1) of B is most probably lower than the first ionization energy (IE1) of A

Explanation:

As mentioned the possible chemical formula for a compound can be predicted from electron configurations of the elements.

The first element 'A' has electronic configuration as "[core]ns²

It means it has two valence electrons and it can give those valence electrons to attain noble gas or full filled stability.

So the element is most likely to form a dipositive ion.

Now for element B the configuration is : [Core]ns²np⁵

thus it has seven valence electrons and it will most likely to accept an electron to gain full filled stability. So B will form a mono negative ion.

The possible formula will be AB₂ [Like MgCl₂]

So the false statements are:

D) the first ionization energy (IE1) of B is most probably lower than the first ionization energy (IE1) of A : the first ionization energy of A will be lower than B as B cannot give an electron easily.

The other statements are correct:

A) element A serves as the reducing agent in the reaction to form AxBy : As A will lose electrons so it will acts as reducing agent and itself gets oxidized

B) yes it is whole number as calculated above.

C) x + y = 1+2 = 3

E) Already calculated that B has oxidation state of - 1.