The element boron, a trace element in Earth’s crust, is found in foods produced from plants. Boron has only two naturally occurring stable isotopes, boron-10 and boron-11. The average atomic mass of boron is 10.81 amu. Which of borons two isotopes is more common?     both are found in the same percentages     Boron-10     Boron-11     none of the above

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A:

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Q: How many atoms of cobalt equal a mass of 58.93g

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.