Question

Which has an electronic configuration

(A)

(B) Al
(C) F
(D) Ti
(E) B

Answer 1

Hint: The given electronic configuration belongs to the p block as the last electron enters in the p orbital. They are representative elements. The elements of group one are called p block elements. We will find the period and the group number and accordingly find the element associated with this configuration.

Complete answer: We know that the p block elements occupying the left part of the periodic table. Here it tells us that it is present in the third row of the periodic table. The ‘p ‘ here tells us that it is present in the p block which is right to the transition metals. The superscript tells us that it is present in the first column of the p block group thirteen. On simplifying it we get that this element has thirteen electrons which is equal to the number of protons which is equal to the atomic number Z. So the element with atomic number is aluminium. It is present in the th group and rd period and it is a part of the boron family.
So the given electronic configuration of the element is of aluminium.

Hence the correct answer is option (B).

Note: This electronic configuration is valid with the assumption that aluminium does not lose or gain an electron to convert to ion. As the atomic number is determined by the protons and not the electrons. This holds for we have assumed it as a neutral atom of an element. So this should be kept in mind.