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Flashcards in Chemistry-Radioactivity Deck (10)
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1

Isotopes

Atoms of the same element that differ in the number of neutrons. In the element.

2

Stable

Describes a nucleus that does not change spontaneously. The protons and neutrons are held together strongly.

3

Unstable

Describes an atom in which the neutrons and protons in the nucleus are not held together strongly.

4

Radioisotopes

A radioactive. Isotope

5

Nuclear radiation

Radiation from the nucleus of an atom, consisting of alpha or beta particles, or gamma rays.

6

Alpha particles

Positively charged nuclei of helium atoms, consisting of two protons no two neutrons.

7

Beta particles

Charged particles that have the same size and mass as electrons

8

Gamma rays

Electromagnetic radiation. Produces in nuclear reactions. No mass. Travel at speed of light.

9

Half-life

Time in which half the radioactive atoms takes to decay, or change into a different element.

10

Cosmic radiation

Naturally background radiation from outer space