An atom is known to become an Ion when it undergoes a chemical reaction. This is become chemical reactions occur as a result of loss or gain of electrons.
When this occurs the atom is said to become an ion.
When am atom gains electrons it becomes negatively charged and is referred to as an anion while when it loses electrons it becomes positively charged and is referred to as a cation.
Small objects usually do not permeate the surface of the water due to its high tension. The covalent bonding of water allows for its unique ability of high surface tension.