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

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.