<span>58.6934 +/- 0.0002 u</span>
Nitrogen is crucial to the marine life and it is disappearing because it cannot be assimilated by most organisms in the water.
Answer:
I think its the last one
Explanation:
its supposed to be H 2 O 2.
Allotropes are elements on the periodic table that have more than one crystalline form . There are three forms of the element carbon : Diamond, Graphite, and Fullerenes. Isotopes are atoms of the same element with the same atomic number but have a different mass number.