PRACTICE EXERCISE: Problem Solving Boron has two isotopes, Boron-10 and Boron-11, whose percentage abundances are 19.8% and 80.2% respectively. The atomic masses of Boron-10 and Boron-11 are 10.0129 amu and 11.0093 amu respectively. Write the symbols for the two isotopes of boron and determine the relative atomic mass. Isotope Mass number Atomic Mass Percentage Abundance Relative Atomic Number Unit Mass

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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.