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Atoms and Molecules Unit 4A

Atoms and Molecules Unit 4A. The Building Blocks of Matter. All matter is formed by:. Atoms Molecules Molecules are groups of different types of atoms bonded together. Subatomic Particles (Parts of an Atom). Proton Electron Neutron Measured by AMU’s A tomic M ass U nit.

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Atoms and Molecules Unit 4A

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  1. Atoms and MoleculesUnit 4A The Building Blocks of Matter

  2. All matter is formed by: • Atoms • Molecules • Molecules are groups of different types of atoms bonded together.

  3. Subatomic Particles(Parts of an Atom) • Proton • Electron • Neutron • Measured by AMU’s • Atomic Mass Unit

  4. Parts of an Atom

  5. Parts of an Atom • Atoms are mostly empty space. Ex: If you put a golf ball in the middle of a football stadium (nucleus), the electrons would be WAY up in the nosebleed sections.

  6. Atomic Models • The current model is Electron Cloud, but it is complicated. So… • We will be using the Bohr Model.

  7. e- e- e- e- e- P+ N0 e- e- e- e- e- The Bohr Model • Electrons surround the nucleus in different energy levels.

  8. Elements • Elements = only 1 kind of atom • The # of PROTONS in that element tell us which element it is • Listed on P.T. as atomic number

  9. The Atomic Number tells us the number of Protons an atom has • It also tells us how many electrons a neutral atom has • REMEMBER - APE

  10. Isotopes • Isotopes – elements that have the same # of protons and a different # of neutrons • Isotopes have different masses.

  11. Atomic Mass • Mass number = the mass of one atom • Atomic mass = the average mass of all isotopes of that element. Mass # = #P+ + #N0

  12. 12 13 14 C C C 6 6 6 Isotope Notation Mass # Atomic #

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