Naturally occurring bromine is composed of two isotopes: 50.69 % Br-79 (mass of 78.9183 amu) and 49.31 % Br-81(mass of 80.9163 amu). Naturally occurring oxygen is composed of three isotopes: 99.757% O-16 (mass of 15.9949 amu), 0.038% O-17 (mass of 16.9991 amu), and 0.205% O-18 (mass of 17.9991 amu). The compound dibromonoxide is composed of two bromine atoms and one oxygen atom bonded together to form the Br2O molecule. a) How many Br2O molecules of different masses naturally exist.
b) Give the masses of the three most abundant Br2O.

the term hydride is commonly named after binary compounds that hydrogen forms with other elements of the periodic table. hydride compounds in general form with almost any element, except a few noble gases. the trends and properties vary according to the type of intermolecular force that bonds the elements together, the temperature, its molecular masses, and other components. hydrides are classified into three major groups, depending on what elements the hydrogen bonds to. the three major groups are covalent, ionic, and metallic hydrides. formally, hydride is known as the negative ion of a hydrogen, h-, also called a hydride ion. because of this negative charge, hydrides have reducing, or basic properties. its special characteristics will be further discussed.

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