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Any atom in the first family of the Periodic Table of elements is very unstable.

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12y ago
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6mo ago

An atom with an excess number of protons or neutrons relative to the number of electrons is more likely to be unstable. Additionally, atoms with a high atomic number (number of protons) tend to be less stable due to increased electromagnetic repulsion between the protons.

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Q: Which would you most expect to be an unstable atom?
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