What is the standrad for the present system of atomic masses?
H - 1
C - 12
He - 4
O - 16
As we learnt in
Atomic Mass Unit -
amu is used to measure mass of individual atoms.
- wherein
mass of one atom of Helium= 4 amu
Today, ‘amu’ has been replaced by ‘u’ which is known as unified mass.
The present system of atomic mass is based on Carbon - 12 as the standard and has been agreed upon in 1961.
Option 1)
H - 1
Incorrect
Option 2)
C - 12
Correct
Option 3)
He - 4
Incorrect
Option 4)
O - 16
Incorrect
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