Section 3-3 Counting Atoms.

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Presentation transcript:

Section 3-3 Counting Atoms

Three Subatomic Particles: Charge Location Proton +1 Nucleus Neutron Electron -1 Electron cloud

Atomic Number The number of protons in an atom Unique for every element

Atoms are always electrically neutral Atoms are always electrically neutral. This means that protons always equal the electron.

How many protons & electrons are in the following atoms? Silicon Nitrogen Zinc 14 p & 14 e 7 p & 7 e 30 p & 30 e

Mass Number The number of protons and neutrons in the nucleus Mass Number – Atomic Number = Neutrons

How Many Neutrons are in: Potassium Argon Tin 20 n 22 n 69 n

Atomic Structure

Lithium

Phosphorus