which of the following is the basis for rutherford's planetary model?

a. positively charged electrons orbit a positively charged nucleus.
b. positively charged electrons orbit a negatively charged nucleus.
c. negatively charged electrons orbit a positively charged nucleus.
d. negatively charged electrons orbit a negatively charged nucleus.

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.