Why does cobalt comes before nickel even if it has high atomic mass

it is because cobalt has less proton and nickel has more and periodic tabke is arranged in sequence in no. of protons

Explanation:

and u have asked one more question the answer for that

:-the last one is mentioned incomplete because the oganesson is newly formed and we it is last atomic no. that is Og118 asthe 32 is big than 31 but the sequence is incomplete because there are more elements s we haven't yet formed

there are blanks in the picture. what kind of winds are being asked about?