Chapter 17 - Radioactivity and Nuclear Chemistry - Exercises - Questions - Page 636: 9

Alpha particles have the lowest penetration and highest ionizing power. This is because while they are fairly large particles, they move the slowest out of all forms of emitted radiation.

Alpha particles have the lowest penetration and highest ionizing power. This is because while they are fairly large particles, they move the slowest out of all forms of emitted radiation.