Idon’t understand this, can you me?

An atom becomes stable if it has a full and complete ring. 2 of the choices are wrong off the start because you can't gain electrons and have a net positive charge, nor can you lose electrons and have a net negative charge. That leaves us with Option A or D. As I said earlier, an atom becomes stable if it has a full and complete ring. Obviously, if you lose 3 electrons from the last ring, the atom would be stable (because the 2nd ring is now full), and it also would have a net positive charge because it lost electrons.

1.4154650940756959Explanation:Hello there,So for this question you want to know how many moles are in 25.5 grams of H2O. the easiest way of solving this is by figuring out how many moles are in 1 gram of H2O, then multiply that by 25.5. Let me show you how. So for one gram of H2O, we have 0.055508435061792 mol. Using a calculator, we can use that 0.055508435061792 mol and multiply it by 25.5 grams of H2O to get the answer.I hope this helped!