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Atomic Mass is the number of protons added to number of neutrons.

Number of protons is element's atomic number, and you can count neutrons by subtracting atomic number from atomic mass.

So, it can be any substance which has a atomic number 12 lower than atomic mass.

Basically, i would say that it is Magnesium 24 isotope [most common Magnesium isotope], because it has 12 protons and 12 neutrons [12 + 12 = 24]

Sodium 23 isotope [also most common] fits perfectly too.

However, it can be any other material's isotope. For example Aluminum 25 [13+12=25] Neon 22 [10+12=22]

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15y ago

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