Question

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> The set that contains atomic numbers of only transition elements is:

JEE MAIN - 2020

Answer 1

A transition element is defined as the one which has incompletely filled d-orbitals in its ground state or in general oxidation state.
The first transition element series have Z= 21 to 29
The second transition element series have Z= 39 to 47
The third transition element series have Z= 57,72 to 79
Elements of option (c) only falls in the region and is the correct option.