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Basics of Biology

Basic Chemistry For Biology

What is an atom?

An atom is the smallest unit of an element, containing the unique chemical properties of that element. Atoms are very small—several million atoms could fit in the period at the end of this sentence.

Subatomic Particle

Charge

Mass

Location

Proton

Positive

1.7 × 10-24 g

Nucleus

Neutron

Neutral

1.7 × 10-24 g

Nucleus

Electron

Negative

9.1 × 10-28 g

Orbits around nucleus



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