Why oxygen was initially considered as a reference for atomic mass?

It has lower mass

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It reacted with large number of elements and formed compounds

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This atomic mass unit gave masses of most of the elements as whole numbers

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Both B and C

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Solution

The correct option is D Both B and C
The reasons were :
(i) It reacted with large number of elements and formed compounds.
(ii) The atomic mass unit gave masses of most of the elements as whole numbers.

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Why oxygen was initially considered as a reference for atomic mass?

The correct option is D Both B and CThe reasons were : (i) It reacted with large number of elements and formed compounds.(ii) The atomic mass unit gave masses of most of the elements as whole numbers.

The correct option is D Both B and C
The reasons were :
(i) It reacted with large number of elements and formed compounds.
(ii) The atomic mass unit gave masses of most of the elements as whole numbers.