It is less than 1 kilogram, certainly.
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Element 34, Selenium, has an atomic mass of about 78.96.
Equal, for all practical purposes, due to conservation of mass. In theory, it can be slightly less, but the effect is insignificant. Do some reading on "mass deficit" for more information; but briefly, energy can escape during a chemical reaction, and this energy has some mass.
Jewels come in several sizes, but usually their mass will be less than a kilogram.Jewels come in several sizes, but usually their mass will be less than a kilogram.Jewels come in several sizes, but usually their mass will be less than a kilogram.Jewels come in several sizes, but usually their mass will be less than a kilogram.
A planet with a greater mass does not necessarily have greater surface area than one with less mass. The planet could be made of denser material and have a smaller surface area. Mass doesn't always mean volume.
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