What are the key differences between atoms and isotopes? Please include structural (mass number, atomic number) differences. Also the key differences in the symbol from the periodic table, to a symbol of an isotope

hey, what do you need . just post the question and i may be able to you : )

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

instead of copying and pasting things off of tests or work done on computer which im sure you did, try and read over the question carefully