How has the model of the atom changed over the years? ?

The model of the atom has dramatically changed over many many years. At first scientist only thought there were electrons which are negatively charged. We learned atoms make up different substances and are the smallest particles of matter, which have subatomic particles that are very small portions of matter.

The model of the atom has dramatically changed over many many years.We learned atoms make up different substances and are the smallest particles of matter, which have subatomic particles that are very small portions of matter. At first scientist only thought there were electrons which are negatively charged.

Explanation:

the major pests we deal with are insects, weeds and fungal diseases. a pesticide is a product, whether organic or chemical, used to kill the target pest. there are other techniques gardeners should use that can prevent the severe infestations that make the use of pesticides necessary