Calcium becomes a +2 ion and each chlorine becomes a -1 ion. The +2 calcium ion and the two -1 chloride ions attract each other and form an ionic bond and the compound calcium chloride. One calcium ...

A molecule is a group of atoms held together ... Chlorine will gain an electron and form a negative ion. The ionic bond is the force of attraction between the oppositely charged ions - a ...

For example, the formula H 2 O shows that a water molecule contains two hydrogen atoms and one oxygen atom.

This makes the water molecule slightly negative at the oxygen end and slightly positive at the hydrogen end. Electrons are attracted to protons within an atom. This is what keeps the atom together.

We’re showing that it’s possible to get useful data from just a single molecule.” The device relies on nanopores to detect ...