3-Determine whether each of the electron configurations given below is an inert gas, a halogen, an alkali metal, an alkaline earth metal, or a transition metal. Justify your choices. (You

can use the periodic table and the electron configuration table – Callister book) \text { (a) } 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{7} 4 s^{2} \text { (b) } 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} \text { (c) } 1 s^{2} 2 s^{2} 2 p^{5} \text { (d) } 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} \text { (e) } 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{2} 4 s^{2} \text { (f) } 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{1}