The number of protons plus neutrons in an atom’s nucleus is the atom’s ________.
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______ is a measure of radiation that considers the biologic…
______ is a measure of radiation that considers the biological effects of different kinds of ionizing radiation.
Two isotopes of the same element have the same number of ___…
Two isotopes of the same element have the same number of _________.
Earth rotates ________.
Earth rotates ________.
We always see the same side of the Moon because ______.
We always see the same side of the Moon because ______.
The findings from the Apollo space missions to the Moon supp…
The findings from the Apollo space missions to the Moon support the idea that the Moon formed from the impact of Earth with a very large object.
The splitting apart of large isotopes into smaller ones is k…
The splitting apart of large isotopes into smaller ones is known as _____.
Atoms of an element that have different numbers of neutrons…
Atoms of an element that have different numbers of neutrons are called isotopes.
The sun belongs to this class of stars.
The sun belongs to this class of stars.
Which of the following elements is a metal?
Which of the following elements is a metal?