Chapter 6.3, Problem 20LC

Interpretation Introduction

Interpretation:

Change in first ionization energy down the group and across the period is to be determined.

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. When elements are arranged in increasing order of atomic number, periodic trends are observed in certain properties.

Answer to Problem 20LC

The first ionization energydecreases down the group while increasing across the period.

Explanation of Solution

Periodic trends are patterns found in the periodic table that show several facets of a particular element.A periodic trend is observed in the first ionization energy also. The amount of energy required to extract the first electron out of a neutral atom is known as the first ionization energy. Ionization energy depends upon the size of the atom. The more the size of an atom less will be ionization energy.

Atomic size increases down the group, so, the first ionization energy decreases down the group.

The atomic size decreases across the period or decreases from left to right, so the first ionization energy increases across the period.