Teens & Depression. â 1 Depression is a serious problem today and one of the nationâs leading killers of teenaged boys when the number of cases of suicide it generates are factored into the equation.
The first organic molecules were probably very simple carbon-based molecules made of few atoms. These molecules then combined with other simple molecules to form more complex molecules. Over many years and probably trillions and trillions of chemical reactions, more complex molecules, and more stable molecules, formed.
There is an empty space between atoms Atoms are completely solid Atoms have no internal structure Each atom (of a different substance) is different in size, weight and shape. Timeline: 180 0âs Scientist: John Dalton John Dalton was the first to adapt Democritusâ theory into the first modern atomic model. JOHN DALTONâS ATOMIC MODEL: 1. All matter consists of tiny particles called atoms 2.