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Isotopes

Isotopes. Atoms of the same element with different numbers of neutrons . What has changed if there is a different number of neutrons. HINT: look at your periodic tables. Something must have changed. What is an isotope?.

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Isotopes

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  1. Isotopes

  2. Atoms of the same element with different numbers of neutrons. • What has changed if there is a different number of neutrons. HINT: look at your periodic tables. Something must have changed. What is an isotope?

  3. If you have a different number of neutrons, that means your atomic mass has changed. • Remember that atomic mass = neutrons + protons • THE NUMBER OF PROTONS NEVER CHANGES. • Why doesn’t this number ever change? What is an isotope

  4. If you change the number of protons you now have a different element. • EX: If you have an atom of Ne (Neon) with 11 protons now.. You actually would have an atom of Na (Sodium) What is an isotope?

  5. Protons Neutrons Electrons Calculate the following in Sodium

  6. Protons  11 Neutrons  12 Electrons  11 Draw out the model Calculate the following in Sodium

  7. Two Sodium atoms Sodium with 11 protons and 13 neutrons. ** Different from periodic table Sodium with 11 protons and 12 neutrons. ** This is what we see on the periodic table.

  8. How do we show isotopes? X: element symbol A: Mass Number # protons + # neutrons in the nucleus Always larger than Z A, X, and Z are very important to remember! Z: Atomic number #protons

  9. What is the element? How many protons are in the element? What is the elements atomic mass? Try it in your notes Na 23 11

  10. What is the element? • Sodium • How many protons are in the element? • 11 • What is the elements atomic mass? • 23 Try it in your notes Na 23 11

  11. What is the element? How many protons are in the element? What is the elements atomic mass? Try it in your notes Cl 33 17

  12. What is the element? • Chlorine • How many protons are in the element? • 17 • What is the elements atomic mass? • 33 Try it in your notes Cl 33 17

  13. An atom of Nitrogen 7 protons Mass number of 14 Try it in your notes

  14. An atom of Nitrogen 7 protons Atomic mass of 14 Try it in your notes N 14 7

  15. Sodium-23 How else do we show isotopes? Mass Number Element Name ** This is what we see on the periodic table

  16. Questions, Comments, Concerns?

  17. Please take out your whiteboards.

  18. Write the isotope symbol for the chemical element that has 6 protons and 8 neutrons (write the symbol both ways)

  19. Write the isotope symbol for the chemical element that has 6 protons and 8 neutrons (write the symbol both ways) Carbon – 14 C 14 6

  20. Write the isotope symbol for the chemical element that has 17 protons and 16 neutrons

  21. Write the isotope symbol for the chemical element that has 17 protons and 16 neutrons Clor Chlorine-33 33 17

  22. How many protons are in the isotope 54Cr? (Chromium-54)

  23. How many protons are in the isotope 54Cr? (Chromium-54) 24 just like all Chromium  Protons NEVER CHANGE

  24. Isotopes of an element always have the same number of neutrons. • A. False • B. True True/false

  25. Isotopes of an element always have the same number of neutrons. • A. False True/false

  26. Isotopes of an element always have the same number of protons. • A. False • B. True True/false

  27. Isotopes of an element always have the same number of protons. • B. True True/false

  28. Z = 9 • A = 29 • Draw the symbol. • How many protons? • How many neutrons?

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