Chapter 6, Problem 66A

Interpretation Introduction

Interpretation:

It is to be explained why more energy is needed to remove an electron from the 4s orbital than calcium.

Concept Introduction : The periodic table is a columnar structure that organizes different elements into groups based on how they behave. The elements in the periodic table of today are ordered according to the periodic law. The elements are organized in the modern periodic table in increasing order of their atomic number. Periodic trends are patterns found in the periodic table that show several facets of a particular element.

Answer to Problem 66A

No. of protons is more in zinc.

Explanation of Solution

The first ionization energy is the energy needed for the extraction of the outermost electron from the neutral gaseous atom. The atomic number of Zinc is 30 and that of calcium is 20. Both are in the same period. So, the electrostatic attraction in zinc increases between electrons and protons. Thus, it is difficult to remove electrons from the 4s sub-shell.