Asked Nov 12, 2019

Arrange the following in order of decreasing atomic radius: Sr, O, Si, Cs, S, Ge


Expert Answer

Step 1

The atomic radius for a given element can be defined as the measure of the measure of the size of the atoms which are present in it or it can also be termed as the distance from the center of the nucleus to the boundary which surrounds the shells of the electrons.

Step 2

As one moves from left to right across the period, the atomic size decreased due to the increase in the nuclear charge, but the number of shells remains the same. Hence, as a result of this, the forces of attraction experienced by the valence electrons due to nucleus increases. Therefore, the atomic size decreases across the period.

Step 3

On the other hand, the atomic size increases as one moves down the group because of the increase in the number of shells. Although down the group both the number of shells and the nuclear ch...

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