A certain element has 5 protons in its atom. One atom of this element needs electrons in order to have a net charge of –1?

When water freezes, it . contracts expands

Why zebra fish experience similar genetic disease as human

What is point source pollution of an aquatic ecosystem? a) pollution of freshwater sources b) pollution from many sources that combine into one c) pollution that occurs over a wide area; water that runs off from fields, parking lots, and other land surfaces d) pollution that can easily be identified with a single discharge source, such as an open pipe which drains into a body of water