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Topic: Atomic spectrum

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	Atom
		The atomic mass A, atomic mass number, or nucleon number of an element is the total number of protons and neutrons in an atom of that element, so-called because each proton and neutron has a mass of about 1 amu.
		The atomic mass listed for each element in the periodic table is an average of the isotope masses found in nature, weighted by their abundance.
		Not all parts of the atomic spectrum are in visible light part of the electromagnetic spectrum.
	www.brainyencyclopedia.com /encyclopedia/a/at/atom.html (3758 words)

	Physics - MSN Encarta
		This solar-system-like atomic model, however, could not persist according to Maxwell's theory, where the revolving electrons should emit electromagnetic radiation and force a total collapse of the system in a very short time.
		The understanding of atomic structure was also facilitated by Becquerel's discovery in 1896 of radioactivity in uranium ore (see Uranium).
		Now nuclei could be understood as consisting of protons and neutrons, collectively called nucleons, and the atomic number of the element was simply the number of protons in the nucleus.
	encarta.msn.com /encyclopedia_761553206_6/Physics.html (2025 words)

	Balloon - Helium
		Janssen obtained the first evidence of helium during the solar eclipse of 1868 when he detected a new line in the solar spectrum.
		Helium was discovered in 1868 by J. Norman Lockyear in the spectrum of a solar eclipse.
		When the temperature in the core of a star reaches about 100 million degrees, three colliding helium nuclei can fuse to form a carbon nucleus.
	www.aballoonaday.com /Helium (456 words)

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