1.23 - 2.covalent-sharing electrons equally-know the...

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92 naturally occurring elements element=substance in which all atoms have the same nuclear charge classification is based on number of protons size of an atom is in ANGSTROM (10 a^-8 cm)—one hundred millionth of a centimeter most ions have radii~1-2A nucleus: (10^-12cm)— density of nucleus: (10^14 gms/cubic cm)—100 million tons atomic number (Z)= # of protons in nucleus atomic mass=(p+n) periodic table: -properties of elements as a fuction of atomic number -number of arrangements of electrons determines character 1.electrons are arranged 2.layers of energy 2.when all energy levels are completed, the element is chemically inert ex: Neon, Argon, etc. Bonding:attachment of ions (+-) to produce electrically neutral compound 1.ionic-electrical (one atom monopolizes valence electron)
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Unformatted text preview: 2.covalent-sharing electrons equally-know the concept of bonding naturally occurring compound=mineral valence electrons-outer shell that jumps to bind atoms into molecules isotope-number if neutrons are different and may change atomic mass A(atomic mass)=Z(protons)+N(neutrons) To measure earth-D=M/V-The Earth is chemically zoned/layered Oxygen-whole earth=30%, crust=46.6% Silicon-whole earth=15%, crust=27.7% Crust is dominated by silicon, oxygen, aluminum, potassium, chlorine-density is low Mantle-made up of more dense elements (iron, magnesium) Core-made of nickel and iron-even more dense *types of minerals we expect to find varies with depth density of earth~5.5-density provides clues to composition(elements-atomic mass)...
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