(optional) You are given nine pennies. One penny was minted in 1980 and the other eight pennies were minted after 1982. The 1980 penny weighs 3.0 grams; the other pennies have copper and weigh only 2.5 grams. Assuming the mint dates are illegible, devise a method usin the balance shown to determine the heavier 1980 penny in only two trials. 3. less

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.

it would be d. henry moseley

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