Physical Science The Atom. Atoms – the smallest recognizable building block used to make all other substances Atom = one Element = many.

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Presentation transcript:

Physical Science The Atom

Atoms – the smallest recognizable building block used to make all other substances Atom = one Element = many

Atoms Atoms are so small that you can count a line of a million carbon atoms or more across your thumbnail So, if they are so small, how do we know anything about them Well, Amazing experiments by cool scientists…… that’s how

Cathode Ray Tube Images from Yahoo images

Development of the Atom Joseph John Thompson - Used cathode ray tube to discover the negative charged electron and the mass to charge ratio on the electron

Development of the Atom Joseph John Thompson - Used cathode ray tube to discover the negative charged electron and the mass to charge ration on the electron Robert Millkan - Determined the electron charge, using oil drop experiment

Development of the Atom Joseph John Thompson - Used cathode ray tube to discover the negative charged electron and the mass to charge ration on the electron Robert Millkan - Determined the electron charge, using oil drop experiment Dmitri Mendeleev - Father of the periodic table – predicted that his unfilled table represented undiscovered elements

Mendeleev’s Periodic Table

Atomic number The number of protons and electrons in an atom

Atomic Mass The number of protons + Neutrons in an atom

Isotope Atoms with the same number of protons but a different number of neutrons