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Atomic%20Structure

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Atomic Structure C. Johannesson Structure of the Atom Protons- Positively charged particles in the nucleus Neutrons-neutrally charged particles in the nucleus ... – PowerPoint PPT presentation

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Title: Atomic%20Structure


1
Atomic Structure
2
Structure of the Atom
  • Protons- Positively charged particles in the
    nucleus
  • Neutrons-neutrally charged particles in the
    nucleus
  • Electrons-negatively charged particles orbiting
    the nucleus

3
A. Mass Number
  • mass protons neutrons

4
Structure of the Atom
  • Atomic Mass-number of protons and number of
    neutrons
  • Atomic Number- number of protons

5
Structure of the Atom Symbols
6
B. Isotopes
  • Atoms of the same element with different mass
    numbers because they have different numbers of
    neutrons
  • Nuclear symbol
  • Hyphen notation carbon-12

7
B. Isotopes
8
B. Isotopes
  • Chlorine-37
  • atomic
  • mass
  • of protons
  • of electrons
  • of neutrons
  • 17
  • 37
  • 17
  • 17
  • 20

9
C. Relative Atomic Mass
  • 12C atom 1.992 10-23 g
  • atomic mass unit (amu)
  • 1 amu 1/12 the mass of a 12C atom
  • 1 p 1.007276 amu1 n 1.008665 amu1 e-
    0.0005486 amu

10
D. Average Atomic Mass
  • weighted average of all isotopes
  • on the Periodic Table
  • round to 2 decimal places

11
D. Average Atomic Mass
  • EX Calculate the avg. atomic mass of oxygen if
    its abundance in nature is 99.76 16O, 0.04 17O,
    and 0.20 18O.

16.00 amu
12
D. Average Atomic Mass
  • EX Find chlorines average atomic mass if
    approximately 8 of every 10 atoms are chlorine-35
    and 2 are chlorine-37.

35.40 amu
13
What is an ion?
  • If an atom has a positive or negative charge it
    is considered an ion
  • It has either lost or gained electrons
  • Cation-Postive Anion-Negative
  • Cl -
  • Mg 2

14
Questions?
  •      Nothing exists except atoms and empty
    space everything else is opinion
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