With these two. in the nucleus of an atom, there are 20 protons and 21 neutrons. what are the atomic number and mass number of this isotope? study the electron dot diagrams. which two elements are most likely to react and form a compound? what type of compound are they likely to form? here's the link for the second one.

Two metal blocks that have slightly different temperatures are placed next to one another. after five minutes, they both have lower but equal temperatures. according to the law of conservation of energy, what  most likelyhappened? energy was created inside the blocks.energy was destroyed inside the blocks.energy was absorbed into the blocks from outside the system.energy was transferred from the warmer block to the cooler block.