You do nothing the first time you hear a loud sound. But each time you hear the sound, you receive a mild electric shock. Eventually, you cringe at the sound, knowing that it means you are about to be shocked. The first time you heard the sound, what type of stimulus was it?

Conditioned stimulus

Explanation:

The conditioned stimulus is a previously neutral stimulus that, after becoming associated with the unconditioned stimulus, eventually comes to trigger a conditioned response.

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.

if someone had the list of traits you provided