You are made up of cells, which are made up of molecules, which are made up of atoms. Your atoms are made up of a nucleus, with positively-charged protons, negatively-charged electrons, and neutrally-charged neutrons orbiting around it (arranged in one or more shells).
The atom has a maximum of 2 electrons in its inner-most shell, and 8 in its second shell…..and its nature is to fill up its out shell, or to empty its outer shell so that it feels balanced. When it is balanced, it is inert, and won’t tend to enter into chemical reactions.
An atom will seek to be balanced, and inert, by gaining or losing electrons. One of the easiest ways it can do this is by bonding with other atoms to share electrons, in order to complete its outer shell (eg. this happens with oxygen molecules). Normally, these bonds are stable. But if something weakens the bond, it can split apart, leaving one atom with an odd, unpaired electron. This atom is now a free radical.
Free radicals arise naturally in your body through normal metabolism and exercise. But environmental factors such as pollution, radiation, chemicals, cigarette smoke and herbicides also spawn free radicals. |