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All About Atomic Structure: Subatomic Particles and Isotopes Explained

Explore the structure of the atom, learn about subatomic particles, isotopes, and the periodic table. Discover how to determine atomic number, mass number, and identify isotopes. Practice drawing Bohr models and test your knowledge with STAR questions.

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All About Atomic Structure: Subatomic Particles and Isotopes Explained

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  1. Ch 4 ATOMIC STRUCTURE

  2. All about the ATOM

  3. The Structure of Atom’sSubatomic Particles

  4. Electrons are TINY compared to a Proton or Neutron

  5. All elements are on the periodic table of elements! GET OUT YOUR PERIODIC TABLE REFERENCE SHEET

  6. Atomic Number is # of p+ & e- in atom Atomic Mass # is average of all of isotopes of atom (decimals) Mass number (atomic mass rounded)is sum of the p+ & nO in atom 1 H 1.0079 round 1.0079 to 1, 1 is mass #

  7. A P E M A N To find # of p+, use Atomic # To find # of e-, use Atomic # To find # of no, subtract Atomic # from Mass # (round & subtract) 9 F 18.988 n0= p+= e-=

  8. 16 ____________

  9. Mass # =__________ Mass # = ___________ Mass # = ____________

  10. Isotopes have same atomic # but different mass # b/c they have different #s of neutrons

  11. Different ways to write isotopes: Carbon-12, 126C, C-12 Atomic # Mass #

  12. Sample chart

  13. Neils Bohr model stated e- move w/ constant speed in fixed orbits around the nucleus, like planets orbiting the sun

  14. Bohr Model

  15. The possible energies e- in atom can have are called energy level (orbital, shell) • e- in atom can move from one energy level to another when atom gains or loses e-

  16. Atomic Orbitals & max e- in each orbital

  17. Practice drawing Bohr models

  18. STAR Questions • How many neutrons does Lithium have? • How many electrons can go in the second orbital? • Draw a Bohr model of Al.

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