down 1.
The path that an electron takes as it moves around the nucleus.
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down 3.
The mass of a proton is approximately ____ to the mass of a neutron.
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down 4.
A ____ atom has the same number of protons and electrons.
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down 6.
These move around an atom's nucleus and have a negative electric charge.
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down 7.
An atom with more protons than electrons has a ____ charge.
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down 9.
The mass of a proton is more than 1,800 times ____ than the mass of an electron.
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down 10.
The central part of an atom.
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down 12.
One of the two particles that make up a nucleus. This has no electric charge.
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across 2.
The mass of a electron is more than 1,800 times ____ than the mass of an proton.
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across 5.
Atoms, which are the same element and have the same number of protons, but have different numbers of neutrons.
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across 8.
One of the two particles that make up a nucleus. This has a positive electric charge.
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across 11.
The ____ between negative and positive protons help to maintain an atom's structure.
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across 13.
An atom with more electrons than protons has a ____ charge.
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across 14.
The majority of an atom is empty ____.
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