Atomic Numbers. Henry Moseley (1887 - 1915) “Moseley, as it were, called the roll of the elements, so that for the first time we could say definitely.

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Presentation transcript:

Atomic Numbers

Henry Moseley ( ) “Moseley, as it were, called the roll of the elements, so that for the first time we could say definitely the number of possible elements between the beginning and the end, and the number that still remained to be found.”

Ions in Water Solution

Mass Spectra Mass Spectroscope Francis William Aston ( )

Modern Mass Spectroscope

Hydrogen Spectrum

Atomic Weights of Some Isotopes ElementIsotopeAtomic Weight Hydrogen 1H1H H2H Helium 4He4He Carbon 12 C12 (exactly) 13 C Oxygen 16 O O Neon 20 Ne Ne Ne Chlorine 35 Cl Cl Uranium 235 U U

Mass Number (A) Isotopic Mass (amu) % Abundance Mercury Spectrum

Atomic Number Atomic Weight

Atomic Structure Worked with: Hans Geiger Ernest Marsden Ernest Rutherford ( )

Gold Foil Experiment

Then I remember two or three days later Geiger coming to me in great excitement and saying, “We have been able to get some of the alpha particles coming backwards…” It was quite the most incredible event that has ever happened to me in my life. It was almost as incredible as if you fired a 15-inch shell at a piece of tissue paper and it cam back and hit you.

Radioactive Elements Pitchblende Pierre and Marie Curie

Large Nuclei