CHEMISTRY1

CHEMISTRY1 - a. 1 st shell - holds 2 electrons b. 2 nd...

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1CHEMISTRY 1. Matter - anything that takes up space and has weight 2. Element - unique substance that cannot be broken down any further 3. Atom - smallest unit of matter, smallest particle of an element a. Parts of an atom - # of protons is the atomic number i. Protons - positive charge ii. Neutrons - no charge iii. Electrons - negative charge b. Atomic weight is protons plus neutrons c. Isotopes - atoms of same element that have same number of protons but different number of neutrons, therefore they have different atomic weights 4. Molecule - combination of 2 or more atoms by bonding 5. Electron shells (energy levels)
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Unformatted text preview: a. 1 st shell - holds 2 electrons b. 2 nd shell - holds 8 c. 3 rd shell - holds 18 d. Covalent bond - atoms sharing electrons - stable bond e. Ionic bond - one atom grabs electrons from another - not as stable f. Rule of 8's - shells are relatively stable with 8 electrons in outer shell 6. Ion - atom that has lost or gained (an) electron(s) 7. Water (H2O) a. Polar covalent bonds - hydrogen bonds occur between water molecules b. Features of water i. High heat capacity ii. Solvent properties of water iii. Cushioning iv. Acid-base scale...
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