Chapter 6, Problem 34A

Interpretation Introduction

Interpretation:

The dark line running down the middle of given figure, needs to be explained.

Concept introduction:

A periodic table consists of groups and periods. The horizontal rows are termed as groups and the vertical rows are termed as periods. The elements with similar properties are placed together in a group.

Answer to Problem 34A

Dark line running down the middle of figure 19 between group 3 and group 4 indicates the location where lanthanides and actinides would have been placed if there was enough space.

Explanation of Solution

Group 3 and 4 belongs to the d-block. These groups include the transition metals and they containvalence electrons in the d-orbital. Atomic number of La is 57, Hf is 72, Ac is 89 and R is 104. Element La and Ac belongs to group 3 and Hf and Rf belongs to group 4 of the periodic table.

Dark line running down the middle of figure 19 between group 3 and group 4 indicates the point at which the orbitals of the inner transition metals are occupied. The line also indicate that the lanthanide and actinides would be placed in that position if there would have existed much horizontal zoom space.

Conclusion

Dark line running downbetween group 3 and group 4 indicates the point at which the orbitals of the inner transition metals are occupied.