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15
×
Radiation is made of energy and particles that come from the ___ of radioactive atoms.
Nuclei
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15
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A negative ion is an atom that has ___ electrons.
Gained
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15
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An ___ particle consists of two protons and two neutrons.
Alpha
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15
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___ occurs when a neutron in an atom changes into a proton and a high-energy electron called a beta particle.
Beta decay
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15
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A positive ion is an atom that has ___ electrons.
Lost
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15
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Gamma rays contain a lot of ___ but no particles.
Energy
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15
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Most of the mass of an atom is in the ___.
Nucleus
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seesaw
Swap points!
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star
Double points!
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rocket
Go to first place!
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baam
Lose 15 points!
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15
×
Henri Becquerel first noticed that some elements spontaneously give off ___.
Energy
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banana
Go to last place!
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seesaw
Swap points!
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gift
Win 20 points!
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lifesaver
Give 20 points!
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15
×
Marie Curie called elements that spontaneously emit radiation ___.
Radioactive
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15
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When atoms release particles of radiation, they change to different ___.
Elements
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baam
Lose 25 points!
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rocket
Go to first place!
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gift
Win 20 points!
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baam
Lose 25 points!
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15
×
Different elements contain different numbers of ___.
Protons
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15
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The number of protons in an atom of an element is the element’s ___.
Atomic number
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15
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___ is a process that occurs when an unstable nucleus changes into another, more stable nucleus by emitting radiation.
Nuclear decay
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