Notes 2.1 contd. - PowerPoint PPT Presentation

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Notes 2.1 contd.

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Notes 2.1 contd. Chemistry of Life 2.1 Radioactive Isotope- Nuclei is unstable and continues to break down at a constant rate Compound- Substance formed by 2 or more ... – PowerPoint PPT presentation

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Title: Notes 2.1 contd.


1
Notes 2.1 contd.
  • Chemistry of Life

2
2.1
  • Radioactive Isotope-
  • Nuclei is unstable and continues to break down
    at a constant rate

3
  • Compound-
  • Substance formed by 2 or more elements in
    definite proportions
  • H2O NaCl

4
  • Chemical Bonds-
  • Involves electrons around nucleus
  • 1. Ionic bonds
  • 2. Covalent bonds

5
  • 1. Ionic bond- 1 or more electron is transferred
    from 1 atom to another
  • (non-metal to metal)

6
  • 2. Covalent bond- electron is shared
  • (non-metal to non-metal)

7
  • Molecule-
  • (Structure) Smallest unit of compounds
  • joined by covalent bonds

8
  • Van der Waals forces-
  • Can hold different molecules together
  • -Not as strong as ionic or covalent bonds

9
  • Electron energy levels
  • 1st 2 electrons
  • 2nd 8 electrons
  • 3rd 8 electrons
  • 4th up to 18
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