There are slightly more than one-hundred elements known to exist. the smallest complete unit of an element that serves as the basic building block of matter is the
a. atom.
b. proton.
c. neutron.
d. nucleus.

10 points! will mark brainiest! in a heat engine if 1,000 j of heat enters the system and the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2,000 j 1: write the equation2: list out your known variables 3: plug the numbers into the equations 4: solve 5: write your solution statement that includes initial energy and final energy added you so much!