Boron (B) has two isotopes, boron-10 and boron-11. The atomic weight of boron is the . combined masses of boron-10 and boron-11 average number of neutrons in boron-10 and boron-11 weighted average of the masses of boron-10 and boron-11 mass of boron-10 minus the mass of boron-11

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Answer is: hydrogen is being oxidized.chemical reaction: co₂ + h₂ → co + h₂o.oxidation half reaction: h₂ → 2h⁺ + 2e⁻.reduction half reaction: c⁺⁴ + 2e⁻ → c⁺².oxidation is increase of oxidation number, hydrogen change oxidation number from neutral charge (in molecule of hydrogen) to oxidation number +1 (in water).

Ican't see the chart but the density of both nickel and cobalt is 8.90 g/cm3, so it would be one of those.