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ModernAtom

ModernAtom - • atomic number number of protons • atomic...

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subatomic particles  - determine the atom's characteristics   electronic charge - 1.602*10-19 coulombs atoms have the same number of protons/electrons, no net charge atomic mass unit (amu) - used to measure atomic mass; equal to 1.66054 x 10-24 grams, 1/12 the mass of a carbon-12 atom angstrom - 10-10 meters; along w/ picometers, used to express atomic diameters; atomic diameter equal to about 1-5 angstroms, atomic nuclei equal to about 10^-4 angstroms interiors of collapsed stars may approach the density within atomic nuclei basic forces  - 4 basic interactions in nature   gravity - attraction between all objects in proportion to their masses; incredibly small between atoms electromagnetism - forces between electrically charged objects strong nuclear force - acts between subatomic particles in the nucleus to keep them together weak nuclear force - weaker than electrical forces, but stronger than gravity; shows up in certain types of radioactivity isotope  - elements that differ in number of neutrons  
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Unformatted text preview: • atomic number - number of protons • atomic mass - number of protons/neutrons • nuclide- atom of a specific isotope • average atomic mass - found by using the masses of all its isotopes and their relative abundance; aka atomic weight periodic table - developed in 1869 • similar elements placed in the same column (group) • chemical/physical properties show repetition • metallic elements- on the left/middle part of the periodic table; shiny, malleable, conductors • nonmetallic elements- separated from metals on the table by a diagonal line from boron to astatine; brittle, dissolves to form salt, insulators • metalloids- elements that have properties falling between metals/nonmentals; shiny/brittle • 8A - unreactive, inert/noble gases; no charge • 1A - alkali metals; +1 charge • 2A - alkaline earth metals; +2 charge • 6A - chalcogens; -2 charge • 7A - halogens; -1 charge...
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