Are the building blocks of matter__________

Atoms are made up of

Is the center of the atom where the neutrons and protons are located

Are positively charged particles (p+)

Are particles that have no charge (n0 )

Are negatively charged particles (e – )

Is a pure substance that cannot be broken down into other substances.

When two or more elements combine, they form

Table of elements organizes information about elements in rows, called periods, and columns, called groups

Living things are composed mainly of three elements

Atoms of the same element with different numbers of neutrons are called

What makes an isotope radioactive?

Proposed an idea that all matter was made up of tiny particles in the fifth century

Word Origin “ATOM

Academic Vocabulary “ISOLATED”:

Compounds such as water are formed when two more substances combine. The force that holds the substances together is called a chemical bond (the electrons are involved directly in forming chemical bonds).

The principles of chemistry are useful in cell biology because all living cells consist of chemicals and various chemical processes take place in many living organisms.

Electrons constantly move around

Atoms contain an equal number of protons and neutrons, so the overall charge of an atom is