Q. (A)  An element X has an atomic number 12 an atomic mass no. 26. Draw a diagram showing the distribution of electrons in the orbits and the nuclear composition of the neutral atom of the element. What is the valency of the element and why?

(B) If this element X combines with another element Y whose electronic configuration is 2,8,7. what will be the formula of the compound thus formed? State how you arrived at this formula.