Chemistry.txt

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Author:
HdzS924
ID:
143525
Filename:
Chemistry.txt
Updated:
2012-03-24 18:47:13
Tags:
Biology
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Description:
Notes from Biology notes for EOC test
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    • author "Flako"
    • tags "Biology"
    • description "Notes from Biology for EOC test"
    • fileName "Chemistry"
    • freezingBlueDBID -1.0
    • Everything in the universe is composed of...
    • Matter
  1. Matter is..
    Anything that occupies space oe has mass
  2. An element is...
    A pure substance that cannot be broken down chemically into simpler kinds of matter
  3. There are more than ______ elements
    100
  4. 90% of mass of an organism is composed of 4 elements, what were they?
    Oxygen, carbon, hydrogen, & nitrogen
  5. Atoms are...
    The simplest particles of an element that retains all the properties of that element
  6. What consist of an atom?
    Protons, Neutrons, and Electrons
  7. Nucleus are
    • - central core
    • - consists of positive (+) charged protons & neutral neutrons
    • - positively charged
    • - contains most of the mass of the atom
  8. All atoms have the same number of...
    Protons
  9. Number of protons called...
    The atomic number
  10. Number of electrons is...
    balanced by an equal # of electrons
  11. Number of neutrons varies slightly among..
    Atoms of the same element
  12. Protons and Neutrons have a mass of...
    1 amu (atomic mass unit)
  13. Atomic mass =
    Protons and Neutrons
  14. Electrons are...
    Negatively charged high energy particles with little or no mass
  15. How many energy levels dotes an atom have?
    7
  16. The levels are
    K (closest to nucleus), L, M, N, O, P, Q (farthest to nucleus)
  17. Level K can only hold ___ ; Levels L to Q can hold ____
    2 ; 8

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