The most likely truth of an atom with a mass of 15 amu is the total number of protons and neutrons is 15. The correct option is D.
Atomic mass is the average mass of an element's atoms, expressed in atomic mass units. The atomic mass of any atom is the total number of protons and neutrons of that atom. It is measured in Dalton or emu.
The mass of any atom tells the total number of protons and neutrons. Where the atomic number is the number of electrons, which is equal to the number of protons.
To find the atomic mass of any atom, we should add the mass number = protons + neutrons.
So, if an atom has a mass of 15 emu it means it will have the protons and neutron which equals 15.
Thus, the correct option is D. The total number of protons and neutrons is 15.
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