Question

How to arrange ions in order of increasing ionic radius?

Answer 1

Hint: In order to solve the given problem, we will consider the concept of effective nuclear charge. Also, remember the trends in the properties that are observed along a period and down a group in the periodic table.

Complete step by step answer:
- To arrange ions in order of increasing ionic radius, the first step is to identify the places of the elements where they are placed in the periodic table. Then according to the trend of the periodic properties in the periodic table.
- Now, as per the general trend of periodic table, when we go down the group the ionic radius will increase because the number of shells increases.
- In case two or more elements are placed in the same period, their effective nuclear charge is taken into consideration.
- The effective nuclear charge is the charge experienced by each electron due to the nucleus. If the positive charge is higher, the size of the ion will decrease. This happens since as the atom loses more electrons the number of protons remain the same so they attract the remaining electrons more strongly and result in the reduction of size of the ion.
- Thus, the effective nuclear charge of each electron increases as the atom loses more electrons.

Note: According to the general trend of periodic table periodic properties, the size will increase as we go down the group due to increase in the number of shells. As we go left to right of the periodic table, the size will go decreasing because the effective nuclear charge will increase.