Chapter 6, Problem 1STP

Interpretation Introduction

Interpretation:

The properties which increase across the period are 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, electronegativity, and ionization energy also.

Answer to Problem 1STP

Option (A)

Explanation of Solution

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

Ionization energy and atomic size are inversely related which means the larger the atomic size lesser will be the ionization energy. As atomic size decreases across the period or from left to right, the ionization energy increases across the period.

Electronegativity also increases across the period from left to right.

So, properties I and II increase across the period.

Thus, option (A) is correct.

Conclusion

As the atomic size decreases across the period, therefore, options (B), (C), and (D) are incorrect.