Who hypothesized that the atom was a tiny hard sphere

the answer is   c.) 1575 j.

explanation:

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements

conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object. collisions between adjacent atoms and molecules transfer kinetic energy from the warmer to the cooler object. the objects must be in physical contact.

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a