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Ch. 2 Part 1. Chemical Level of Organization. Chemistry Review. You should already know this! If you don’t, make notes. What are: atoms nucleus p rotons neutrons electrons energy levels a tomic number mass number molecule c ompound cation anion

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ch 2 part 1

Ch. 2Part 1

Chemical Level of Organization

chemistry review
Chemistry Review
  • You should already know this!If you don’t, make notes.
  • What are:

atoms nucleusprotons

neutrons electrons energy levels

atomic number mass number molecule

compoundcation anion

ionic bond covalent bond chemical reaction

reactants products

atoms
Atoms
  • Atoms – smallest units of matter
  • Have a nucleus – center
    • Protons – positive, live in nucleus
    • Neutrons – neutral, live in nucleus
    • Electrons – negative, live in energy levels
periodic table1
Periodic Table
  • Atomic number – big number on periodic table, tells the number of protons
  • Mass number – small number on periodic table, tells the number of protons + neutrons
  • IN A NEUTRAL ATOM – the number of protons = the number of electrons
  • Practice
    • Neon, gallium, zirconium, chlorine
compounds vs molecules
Compounds vs. Molecules
  • Compound – contains 2 or more different elements
    • Examples – H2O, NaCl, MgCl2
  • Molecules – contains 2 or more atoms that share electrons
    • Examples, H2O, O2
bonding
Bonding
  • 2 Types – ionic and covalent
  • Ionic bonds – occur between ions, atoms give/take electrons
  • Covalent bonds – occur between atoms, atoms share electrons
ionic bonds
Ionic Bonds
  • Ions give or take electrons
  • Cations - + ions
  • Anions – ions
  • When put together properly, compound should be neutral
  • Practice: sodium and chlorine
    • Na is a cation (Na+), chlorine is an anion (Cl-)
    • NaCl
covalent bonds
Covalent Bonds
  • Atoms share electrons
  • Must meet the octet rule – each atom must have 8 electrons
  • Use Lewis structures for help
  • We will not worry about bonding angles or shape
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