Question

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Why oxygen is not taken for atomic mass unit but carbon is taken..?
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Answer 1

Answer:

because carbon is covelent bond it mean carbon is atom which was friendly nature

Explanation:

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Answer 2

Carbon-12’s atomic mass could be measured particularly accurately compared to the other elements on the periodic table.

Carbon-12 is the standard while measuring the

atomic masses. Because no other nuclides other

than carbon-12 have exactly whole-number masses

in this scale.

This is due to two following factors:

1. the different mass of neutrons and protons acting to change the total mass in nuclides with proton /neutron ratios other than the 1:1 ratio of carbon-12.
2. an exact whole-number will not be located if there exists a loss/gain of mass to difference in mean binding energy relative to the mean binding energy for carbon-12.

This is bit hard to grasp.In class 11th my teacher told me this 3 times still I couldn't clear my doubt at that time.