This started 10 to 20 billion years ago. Two types of stable particles began to assemble. They were protons and neutrons. Protons have a positive charge and electrons a negative charge. From these atoms, blown apart, formed and reformed, the stars and planets were reformed.
All matter is made up of a combination of elements.
An element is a substance that cannot be broken down into other substances by ordinary chemical means. The four most common elements on earth are also the most common in the body. They are oxygen, carbon, hydrogen and nitrogen. Atoms of each different element have a characteristic number of protons in their nucleus. Hydrogen has 1 and Carbon has 6.