This question is worth 5 marks, answer all parts.

a. Write the condensed electronic configuration of the following atoms in their free state. (3 marks)

i. Cr

ii. Fe

iii. Zn

b. For the main group elements, atomic size increases down the group. For the transition metals, how does the atomic size change from the 4d series to 5d series? What is the factor that causes the difference between these two types of elements? (2 marks)