(Solved): Q4. a) Identify and determine whether each of the following electron configurations is an inert gas ...

Q4. a) Identify and determine whether each of the following electron configurations is an inert gas, halogen, alkali, alkali earth metal a transition metal. Justify your choices: i. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{7}4s^2$ [3 marks] ii. $1s^{2}2s^{2}2p^{6}3s^{2}3p^6$ [3 marks] iii. $1s^{2}2s^{2}2p^5$ [3 marks] iv. $1s^{2}2s^{2}2p^{6}3s^2$ [3marks] b) Briefly explain the difference between the atomic models - Bor and Wave mechanical. [3 marks] c) Calculate the total number of atomic sites $($ atoms $/{\mathrm{m}}^3$ ) for copper at $1000^{?}\mathrm{C}$. The atomic weight and density for copper at $1000^{?}\mathrm{C}$ are $63.5\mathrm{g}/\mathrm{mol}$ and $8.4\mathrm{g}/{\mathrm{cm}}^3$ respectively. Take Avogadro's number, ${\mathrm{N}}_{\mathrm{A}}=$ $6.023\times 10^{23}$ atoms $/$ mole. [5 marks]