Radioactivity Flashcards

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1
Q

Isotopes

A

Atoms of the same element that differ in the number of neutrons in the nucleus

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2
Q

Stable

A

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

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3
Q

Unstable

A

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

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4
Q

Radioisotopes

A

A radioactive form of an isotope

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5
Q

Nuclear radiation

A

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

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6
Q

Alpha particles

A

Positively charged nuclei f helium atoms, consisting of two protons and two neutrons

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7
Q

Beta particles

A

Charged particles (positive or negative) with the same size and mass as electrons

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8
Q

Gamma rays

A

High-energy electromagnetic radiation produced during nuclear reactions. They have no mass and travel at the speed of light

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9
Q

Half-life

A

Time taken for half the radioactive atoms in a sample to decay - that is, change into atoms of a different element

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