40. Determine in which period, group, subgroup is the element, the electronic formula of which has the following ending: 1) ... 4d15s2; 2) …3s23p2; 3) …4p65s1. What family of elements does it belong to, what is the maximum oxidation state it can exhibit?

If you do not open the file - install the RAR archiver. Inside the archive you will find a solution in Word format.