Question

Why initially Oxygen was used as standard reference for atomic mass? please help me

Answer 1

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It was the original standard for atomic mass because oxygen forms simple, binary compounds (oxides) with almost every other element. ... Since hydrogen is the lightest element, and oxygen weighs about 16 times as much as hydrogen, the atomic weight standard for about a century was “oxygen = 16 exactly.”

Answer 2

Explanation:

It was the original standard for atomic mass because oxygen forms simple, binary compounds (oxides) with almost every other element. ... Since hydrogen is the lightest element, and oxygen weighs about 16 times as much as hydrogen, the atomic weight standard for about a century was “oxygen = 16 exactly."