Boron (b) has two naturally occurring isotopes: boron-10 (abundance = 19.8%,

mass = 10.013 amu) and boron-11 (abundance = 80.2%, mass = 11.009 amu).

calculate the atomic mass of boron.

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.

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