Chapter 3, Problem 4STP

Interpretation Introduction

Interpretation: Option representing a pair of isotopes needs to be identified.

Concept Introduction: Every matter is made of chemicals; the importance of chemistry is that it's the study of everything. Chemistry is all about how something interacts to affect the structure, composition, as well as knowing properties of substances.

Answer to Problem 4STP

Correct answer: The correct option is C.

Explanation of Solution

Reason for correct option:

An atom has a nucleus with a positive charge due to its protons and has electrons in the space surrounding the nucleus at relatively large distance from it. Isotopes are atoms of same element with different neutrons.

Isotopes of an element will have different masses and number of neutrons and also, it has same number of electrons, protons. Isotopes of element react in exactly the same way because reactions involve neutrons, electrons have no effect on chemical reactions.

According to the definition of isotopes, carbon $12$ and carbon $12$ represents a pair of isotopes. So, the correct option is C.

Conclusion

Reasons for incorrect options:

Option A: This option does not represent a pair of isotopes. So, this is an incorrect option.

Option B: This option does not represent a pair of isotopes. So, this is an incorrect option.

Option D: This option does not represent a pair of isotopes. So, this is an incorrect option.