All ions are atoms with a

positive charge.
negative charge.
charge.
neutral charge.

i know its definitely not d.

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?

If you put a helium-filled balloon in the refrigerator, what will happen?

Ne way in which elements differ from each other is the structure of the electron cloud in each element's atoms. in an electron cloud, an electron that is farther away from the nucleus has