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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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- Fall '08