Ahypothetical element consists of 3 isotopes
with the following masses and natural abundances.
isotopic natural
mass abundance
number %
1 39 78.8
2 40 18.1
3 41 3.1
what is the atomic weight

Which characteristics can be used to differentiate star systems? check all that apply.

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.

A2.5% (by mass) solution concentration signifies that there is a 2.5 % (by mass) solution concentration signifies that there is blank of solute in every 100 g of solution. of solute in every 100 g of solution