Question

1. analyze: an isotope is an alternative form of an element. each isotope of an element has the same number of protons, but a different number of neutrons. the isotope is represented by the atomic symbol and mass number, such as he - 4. some isotopes are stable, while others are radioactive, which means the atoms decay over time and emit radiation.

a. what are the stable isotopes of carbon?
b. what are the stable isotopes of nitrogen?
c. list two radioactive isotopes of oxygen:

Explanation:

Step1: Recall carbon isotopes

Carbon has two stable isotopes.

Step2: Recall nitrogen isotopes

Nitrogen has two stable isotopes.

Step3: Recall radioactive oxygen isotopes

Oxygen has several radioactive isotopes.

Answer:

A. Carbon - 12, Carbon - 13
B. Nitrogen - 14, Nitrogen - 15
C. Oxygen - 13, Oxygen - 15