Relative mass - 2.2 - (1)
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What does the strong nuclear force which holds together protons and neutrons come at the expense of?
the loss of a fraction of the mass of the protons and neutrons
Who came up with this fact that protons and neutrons lose a fraction of their mass?
albert einstein over 100 years ago
What is the small amount of mass lost called?
mass defect
How do chemists calculate the mass of atoms?
a standard isotope is needed to base all atomic masses
What is the standard isotope needed to base all atomic masses?
carbon-12 isotope, which is the standard isotope for the measurement of atomic masses
What does one atom of carbon-12 have the mass of?
1.92646538 x 10^-26kg
Instead of working in kg, what is the alternative unit called?
atomic mass unit (u)
What is the mass of carbon-12 isotope defined as?
12 atomic mass units (12u)
What is the standard mass for atomic mass?
1 u
Essentially, what is 1u the approximate mass of?
a proton or a neutron
What is relative isotopic mass?
the mass of an isotope relative to 1/12th of the mass of an atom of carbon-12
Why does relative isotopic mass have no units?
because it is a ratio of two masses