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La masa atómica unitaria se define asignando una masa de 12 amu a un átomo del isótopo 12 del carbono. En estas unidades, el átomo de H tiene una masa de 1,0078 amu y el de O 15,9949 amu

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MASS NUMBER: NUMBER OF PROTONS + NUMBER OF NEUTRONS

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Hydrogen Bomb vs. Atomic Bomb: What’s The Difference?

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Los isotopos de un elemento dado contienen el mismo número de protones (y electrones) porque son átomos de un mismo elemento.

La diferencia se radica en su masa, ya que contienen diferente números de neutrones en su núcleo.

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JAMES CHADWICK AND THE DISCOVERY OF THE NEUTRON

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JAMES CHADWICK AND THE DISCOVERY OF THE NEUTRON

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Follow us at: https://plus.google.com/+tutorvista/ Check us out at http://chemistry.tutorvista.com/nuclear-chemistry/protons-and-neutrons.html Neutrons The neutron is a subatomic particle with no net electric charge and a mass slightly larger than that of a proton. They are usually found in atomic nuclei. The nuclei of most atoms consist of protons and neutrons, which are therefore collectively referred to as nucleons.

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Henry Becquerel (1852-1908) se encontraba estudiando un compuesto de Uranio, cuando descubrió que espontáneamente emite radiación de gran energía.

Esta emisión espontánea de energía de radiación se llama “radioactividad”.

Marie Curie y su esposo comenzaron experimentos para aislar componentes radioactivos de un compuesto.

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Radioactivity: Expect the unexpected - Steve Weatherall

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ROBERT MILLIKAN EXPERIMENT 








(1868–1953)

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ROBERT MILLIKAN EXPERIMENT 








(1868–1953)

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Millikan's oil drop experiment to determine charge of an electron - Chemistry

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Incredible Homemade Cathode Ray Tube - Part 1

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Ask any questions in the comments. Do not attempt to recreate this experiment. The vacuum on this tube is not enough to create a beam that does not glow so bright. This may be considered a "rarified arc in a vacuum" but it still demonstrates the properties of a cathode ray tube.

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How Small Is An Atom? Spoiler: Very Small.

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" when two elements combine with each other to form more than one compound, the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers"

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The History of Atomic Chemistry: Crash Course Chemistry #37