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Atomic number means the number of protons. It doesn't make any sense that an atom has -1 protons. So, there's no atom which has an atomic number of -1.

However, in nuclear decays, some particles, such as the beta-minus particle, have this symbol : -10Beta.

So you see, you might think that a beta particle has a proton number of -1, but this is not true. The -1 simply shows the charge on the beta particle, to make it easier to balance the nuclear decay equations.

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13y ago
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9y ago

Hydrogen is a non metal element. Mass number of it is 1.

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14y ago

ermm.....

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Hydrogen

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Q: Which element has a mass number of 1?
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