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Chapter 2 Notes-Atoms, Molecules, and Life

Chapter 2 Notes-Atoms, Molecules, and Life - BIOL V01...

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BIOL V01 Algiers Chapter 2 Notes (Atoms, Molecules, and Life) Atom-Fundamental ____________________ unit of ___________ Subatomic Particles- 1. proton 2. neutron 3. electron Periodic Table (pg 904) Element – A substance that cannot be _________________ nor ______________ to another substance by ordinary ____________________________ Common elements in living organism (% by weight in humans- pg 22 Nitrogen _______________ % Carbon _______________ % Oxygen _______________ % Hydrogen _______________ % Examples: a) Oxygen O 8 protons Atomic # _______ 8 neutrons 8 electrons Atomic mass _______ b) Fill in the following: Element ____________ Atomic # ____________ Atomic mass ____________ Protons ____________ 1 11 Na 22.99
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BIOL V01 Algiers Neutrons ____________ Electrons ____________ Isotope – atoms of the same ______________ with different _________ numbers C12 ( ____ p ____ n) C14( ____ p ____ n) Some isotopes are ___________________ Spontaneously ____________________ & form ___________________ while releasing ________________ Read Scientific Inquiry: Radioactivity in Research (pg 24) Electrons Electrons orbit through diff. energy levels Rule for electron numbers in shells o 1 st shell o 2 nd shell o 3 rd shell And so on… - Examples : Atoms React with One Another Molecules - _________________ atoms of the same or of different elements held together with ______________________ 2 Always fill up the ______________energy level More stable when shells are ______________ (octet rule)
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