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Protons and neutrons have about the same ___.
Mass
___ have much less mass than the other two particles in an atom.
Electrons
Most of the mass of an atom is in the ___.
Nucleus
The number of protons in an atom of an element is the element’s ___.
Atomic number
Different elements contain different numbers of ___.
Protons
In a neutral atom, the number of ___ equals the number of protons because the number of negative charges must equal the number of positive charges.
Electrons
___ are atoms of the same element that have different numbers of neutrons.
Isotopes
The total number of protons and neutrons in an atom is the __ of the atom.
Mass number
The ___ of an element is the average mass of the element’s isotopes.
Average atomic mass
The average atomic mass is ___ according to the abundance of each isotope.
Weighted
Henri Becquerel first noticed that some elements spontaneously give off ___.
Energy
Marie Curie called elements that spontaneously emit radiation ___.
Radioactive
Radiation is made of energy and particles that come from the ___ of radioactive atoms.
Nuclei
When atoms release particles of radiation, they change to different ___.
Elements
___ is a process that occurs when an unstable nucleus changes into another, more stable nucleus by emitting radiation.
Nuclear decay
Nuclear decay can produce three different types of ___.
Radiation
