The Atomic Theory The smallest particle of an element that can enter into chemical change. 2. Building block of all matter. 3. Consists of a central nucleus.

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Presentation transcript:

The Atomic Theory The smallest particle of an element that can enter into chemical change. 2. Building block of all matter. 3. Consists of a central nucleus and electron orbitals outside the nucleus.

Nucleus - Center of the atom Contains protons & neutrons Protons - Neutrons - Positively charged particle found in the nucleus. Non-charged (neutral) particle found in the nucleus. Electrons - Negatively charged particle. Orbits the nucleus of an atom. The mass of the atom is in the nucleus. Proton = 1 Neutron = 1 Electron = 0