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What contains 15 neutrons and 13 protons?
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What contains 15 neutrons and 13 protons?

User Andy Mortimer
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An isotope of Aluminium, a 'normal' Al atom would have a proton number of 13 (as this does not change in isotopes of the same element) but only 14 neutrons. This isotope of Al has 1 extra neutron than regular Al.
User Limbic System
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