Oxygen and hydrogen share some common characteristic. It is similar in that they are gaseous, odorless but colorless elements. It combines to form water which is vital for all living things. all living things depend to oxygen and hydrogen directly and indirectly. Although oxygen and hydrogen have similarities they differs from each other for certain respects. Oxygen belong to the group 16 element and hydrogen was the first element in the periodic table. Oxygen contains 8 electrons and eight protons like hydrogen, which has one electron and one proton. Oxygen is accounted for near 21% of the earth atmosphere, and only a negligible amount of hydrogen is present in it. Oxygen is an oxidizing agent, but hydrogen is reducing agent.

Oxygen and hydrogen share some common [?]. [?] similar in that they are gaseous, odorless [?] colorless elements. [?] to form water[?] which is vital for all living things. [?] living things depend [?] oxygen and hydrogen directly and indirectly. Although oxygen and hydrogen have similarities[?] they [?] from each other [?] certain respects. Oxygen [?] to the group 16 element [?] hydrogen [?] the first element in the periodic table. Oxygen contains [?] electrons and eight protons [?] hydrogen, which has one electron and one proton. Oxygen [?] for [?] 21% of the [?] atmosphere, [?] only a negligible amount of hydrogen is present in it. Oxygen is an oxidizing agent, but hydrogen is [?] reducing agent.