Biology. Chapter 3 Section 1. Atoms. Smallest unit of matter that can not be broken down by chemical means. All matter is made up of atoms. Positively charges core surrounded by a negatively charged region. Atomic Structure. Atoms are made of three types of particles.
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Chapter 3 Section 1
Atoms have no overall charge because each has the same # electrons and protons.
example: Each atom of the element carbon has 6 protons.
Atoms of an element can have different number of neutrons. These atoms are isotopes.
Atoms tend to combine with each other so that eight electrons will be in the valance shell.