Question

5th period elements each element 10 and list of elements with electronic configuration

Answer 1

List of 5th period (4d series) elements with electronic configurations: Y: $[Kr]\,4d^1\,5s^2$

Zr: $[Kr]\,4d^2\,5s^2$

Nb: $[Kr]\,4d^4\,5s^1$

Mo: $[Kr]\,4d^5\,5s^1$

Tc: $[Kr]\,4d^5\,5s^2$

Ru: $[Kr]\,4d^7\,5s^1$

Rh: $[Kr]\,4d^8\,5s^1$

Pd: $[Kr]\,4d^{10}$

Ag: $[Kr]\,4d^{10}\,5s^1$

Cd: $[Kr]\,4d^{10}\,5s^2$

Answer 2

The 5th period's d-block (or 4d series) contains 10 elements because the d subshell has 5 orbitals, each of which can hold 2 electrons (totaling 10 electrons). The 10 elements in this series and their ground state electronic configurations are:

1. Yttrium (Y, Z = 39):

   $[Kr]\,4d^1\,5s^2$

2. Zirconium (Zr, Z = 40):

   $[Kr]\,4d^2\,5s^2$

3. Niobium (Nb, Z = 41):

   $[Kr]\,4d^4\,5s^1$

   (Note: There is an anomalous configuration where one electron shifts from 5s to 4d for extra stability.)

4. Molybdenum (Mo, Z = 42):

   $[Kr]\,4d^5\,5s^1$

5. Technetium (Tc, Z = 43):

   $[Kr]\,4d^5\,5s^2$

6. Ruthenium (Ru, Z = 44):

   $[Kr]\,4d^7\,5s^1$

7. Rhodium (Rh, Z = 45):

   $[Kr]\,4d^8\,5s^1$

8. Palladium (Pd, Z = 46):

   $[Kr]\,4d^{10}$

   (Pd has a completely filled d subshell with no 5s electrons in the ground state.)

9. Silver (Ag, Z = 47):

   $[Kr]\,4d^{10}\,5s^1$

10. Cadmium (Cd, Z = 48):

    $[Kr]\,4d^{10}\,5s^2$

Core Explanation:

The 4d (d-block) series in the 5th period contains 10 elements because the d subshell can hold a maximum of 10 electrons.