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Warm-UP

Warm-UP. What particle(s) contribute to the: Atomic number Atomic mass Charge. Atomic Number = # p + Atomic Mass = # p + + # n 0 Charge = # p + - # e -. Subatomic Particles. Ions. Atoms that represent the same element but have a net charge.

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Warm-UP

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  1. Warm-UP • What particle(s) contribute to the: • Atomic number • Atomic mass • Charge

  2. Atomic Number = # p+ • Atomic Mass = # p+ + # n0 • Charge = # p+ - # e-

  3. Subatomic Particles

  4. Ions • Atoms that represent the same element but have a net charge. • Formed with an atom gains or loses electrons. • Why doesn’t an atom form if we gain or lose protons?

  5. Activity • Everyone pick a number between 5 and 20. Write this number on your note card. • Take that number of beans and keep them on your desk.

  6. Activity • The number on your note card cannot change. What does this represent in an atom? • The beans represent electrons. • What charge are you right now? • # p+ - # e- • (# on card - # of beans)

  7. Activity • Leave your cards on your desk. • Girls can give away up to 3 beans. They cannot accept any beans. • Boys can accept only 3 beans total. They cannot give any away. • When you finish exchanging beans return to your seat.

  8. Activity • Count your number of beans and calculate your net charge. • # p+ - # e- • (# on card - # of beans)

  9. Cations and Anions • Cation: An ion with a positive charge. These ______ electrons. • Anion: An ion with a negative charge. These ______ electrons. • What type of ion did you represent in the activity?

  10. Writing Ions Ion Charge Element Symbol +2 Mg Superscripts tell us the charge of ions.

  11. Practice HOMEWORK: Page 13 in your study guide packet.

  12. Review Ions • Ions represent the same element but have different __________. • Ions of the same element differ in the number of ________. • How would you write the calcium ion that has a +2 charge?

  13. Isotopes • Atoms that represent the same element but have different masses. • Atoms that have the same number of protons but a different number of neutrons. • Why doesn’t an isotope form if we change the number of protons?

  14. Isotopic Symbol This is the isotopic symbol for an isotope of nitrogen. What do the numbers represent? 15 N 7

  15. Isotopic Notation Element Symbol Atomic mass 12 C Atomic number 6 Carbon-12 or C-12

  16. Isotopes of Hydrogen • A. hydrogen (hydrogen-1) • # p+ = # n0 = # e- = • Isotopic Symbol: • B. deuterium (hydrogen-2) • # p+ = # n0 = # e- = • Isotopic Symbol: • C. tritium (hydrogen-3) • # p+ = # n0 = # e- = • Isotopic Symbol:

  17. Practice • Complete the table for carbon isotopes on your notes page. • Go back to page 11 and complete the first two columns (Isotopic Name and Isotopic Symbol).

  18. Representing Isotopes and Ions • How do we write an ion in shorthand? • What does an isotopic symbol look like? • Is there a way these two shorthand symbols can be written in one symbol?

  19. Complete Isotopic Symbol Ion Charge Atomic mass - 19 F Atomic number 9 Element Symbol

  20. Practice • Go back to page 13 and complete the first column (Complete Isotopic Symbol). • Homework: Pages 9 and 10 in your study guide packet. • Next quiz: Friday (Beanium Lab Quiz) • Unit test: November 7

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