(a) (i) The atomic number of Co is 27 and its valence shell electronic configuration is 3d74s2.
Co is in +3 oxidation state in the complex [CoF6]3-.
 (Find detailed answer | clicking on this link)

(Get CBSE, ICSE and all State Boards textbook solutions for all subjects Class 8 to 12. You can also get CBSE solved papers of previous year from here! You can also prepare for SSC. Can also test SSC, find SSC Resource centre ! You can get resources online for free for NEET, NEET previous year solved paper and JEE, JEE Previous year solved papers! Student can also find the, previous year papers etc. This is an organization related to the education sector! So you should not waste your precious time and join https://www.zigya.com/)

---

Sapphire Carbon
Get best price for Sapphire Carbon By Rapid Delivery Services, You can order it online at https://www.rapiddeliveryservices.in/buy-rds-products-online-456.html