Question

question 15 (5 points)
listen
an element that emits energy by nuclear decay is
a) radioactive
b) an ion.
c) a cation.
d) an anion.

Explanation:

To solve this, we analyze each option:

• Option A: Radioactive elements are defined as those that emit energy (and particles) through nuclear decay (like alpha, beta, gamma decay).
• Option B: An ion is an atom with a net charge (gained/lost electrons), not related to nuclear decay.
• Option C: A cation is a positively charged ion (lost electrons), not related to nuclear decay.
• Option D: An anion is a negatively charged ion (gained electrons), not related to nuclear decay.

So the element emitting energy via nuclear decay is radioactive.

Answer:

A) radioactive