Chapter 6, Problem 2STP

Interpretation Introduction

Interpretation:

The increasing order of atomic radii for the given elements is to be identified.

Concept Introduction :

Periodic trends are patterns found in the periodic table that show several facets of a particular element. A periodic trend is observed in atomic size also. Atomic size increases down the group. Whereas atomic size decreases across the period or decreases from left to right.

Answer to Problem 2STP

Option (C)

S Na Cs

Explanation of Solution

Atomic size increases down the group. Whereas atomic size decreases across the period or decreases from left to right.

Chemical symbols of sodium, sulfur, and cesium are Na, S, and Cs respectively. Na and S are present in the same period. But S is present in group 16 which is the extreme right of the periodic table. So, S will be the smallest in size.

Cesium is present in period 6 and group 1. So, it is present down to Na. Down the group atomic size increases. So, Cesium will be the largest in size. Thus, the increasing order of atomic radii is as shown,

S, Na, Cs

Thus, option (C) is correct.

Conclusion

Option (B) is the decreasing order of atomic radii, so it is incorrect.

Option (A) is incorrect because S is smaller than Na.

Option (D) is incorrect because Cs is larger than S and Na.