The maximum number of amino acid side chains that can potentially form an ionic bond ( - interaction) with the side chain of His is _at pH 2.1 ; ___at pH 7 and __at pH 11.5 and __at pH 13.5. (assume no partial charges, only /- whole number integers)

Ageochemist examines a piece of metal that he found in the soil. he performs tests to identify the metal from its density, electrical conductivity, and melting point. which statement best describes his investigation? a. he is determining physical properties that are sufficient to identify the metal.b. he is determining chemical properties that are sufficient to identify the metal.c. he is determining physical properties that are insufficient to identify the metal.d. he is determining chemical properties that are insufficient to identify the metal.