Me plz i don't understand my science hw

5) 10
6) is correct-9
Your other answers are correct as well just when answering the second to last problem you look just the atomic number which is how many protons there is in that element. It has nothing to do with its atomic mass which is what you wrote down

Distance^2= yellow line ^2 (see picture) = 30^2 + 49^2so distance = squareroot of (300^2 +49^2)i dont know if this is how to solve it, but i cnt think of another way