Match the word to its definition/description.

Column A
1.
Radioactivity:
Radioactivity
2.
Radioisotope:
Radioisotope
3.
Isotope:
Isotope
4.
Radiation:
Radiation
Column B
a.Rays and particles emitted by radioactive materials
b.atoms of the same element with differing numbers of neutrons
c.when a substance spontaneously emits radiation
d.an atom with an unstable nucleus

1. Radioactivity: c. when a substance spontaneously emits radiation

2. Radioisotope: d. an atom with an unstable nucleus
3. Isotope: b. atoms of the same element with differing numbers of neutrons
4. Radiation: a. Rays and particles emitted by radioactive materials

To match the words to their definitions/descriptions, here is the correct pairing:

1. Radioactivity: c. when a substance spontaneously emits radiation
2. Radioisotope: d. an atom with an unstable nucleus
3. Isotope: b. atoms of the same element with differing numbers of neutrons
4. Radiation: a. rays and particles emitted by radioactive materials

To match the words to their definitions/descriptions, you can compare the information provided in Column A with the descriptions in Column B. Let's break down the definitions/descriptions for each term:

1. Radioactivity:
Definition: Radioactivity is when a substance spontaneously emits radiation.
Description: This describes the process by which a substance releases rays or particles without any external influence.

2. Radioisotope:
Definition: An atom with an unstable nucleus.
Description: This refers to atoms that have an unstable arrangement of protons and neutrons in their nuclei, leading to their tendency to emit radiation.

3. Isotope:
Definition: Atoms of the same element with differing numbers of neutrons.
Description: This pertains to variants of an element that have the same number of protons but different numbers of neutrons in their nuclei.

4. Radiation:
Definition: Rays and particles emitted by radioactive materials.
Description: This encompasses the emission of energy in the form of rays (such as alpha, beta, or gamma rays) or subatomic particles from radioactive substances.

Now, let's match the words to their corresponding definitions/descriptions:

1. Radioactivity: c. when a substance spontaneously emits radiation
2. Radioisotope: d. an atom with an unstable nucleus
3. Isotope: b. atoms of the same element with differing numbers of neutrons
4. Radiation: a. rays and particles emitted by radioactive materials