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Unit 2 – Atomic Structure Ms Rose Capanema

Unit 2 – Atomic Structure Ms Rose Capanema. Sites. http://www.freezeray.com/chemistry.htm Atom Builder Simulation: http://www.freezeray.com/flashFiles/atomBuilder.htm What ion is formed by the following elements? Mg, Al S and Ar. First Image of Hydrogen.

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Unit 2 – Atomic Structure Ms Rose Capanema

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  1. Unit 2 – Atomic StructureMs Rose Capanema

  2. Sites http://www.freezeray.com/chemistry.htm • Atom Builder Simulation: http://www.freezeray.com/flashFiles/atomBuilder.htm • What ion is formed by the following elements? Mg, Al S and Ar

  3. First Image of Hydrogen • http://io9.com/the-first-image-ever-of-a-hydrogen-atoms-orbital-struc-509684901

  4. The atom is the smallest particle of matter • Look at the periodic table and find Na, Natrium or sodium.

  5. Model of the Atom The atom of Nitrogen has 7 protons and 7 electrons . It is neutral!!!! Particles

  6. Properties • Atomic Number(Z): protons • Mass Number(A): neutrons+protons

  7. Notation:

  8. Examples • What would be the notation for the atom given?

  9. Complete the following:

  10. Atoms x Ions Atoms are neutral because # protons = # electrons Ions are atoms that lost or gained electrons. 11 Na ---------- >11 Na 1+ p=11+ p=11+ e=11 - e=10- 9 F ------------ >9 F 1- p=9+ p=9+ e=9 - e=10-

  11. Exercise a) V1+ p= e= b) P3- c) C4+ d) O 2-

  12. Isotopes • Isotopes are atoms with the same number of protons, but different numbers of neutrons.

  13. Isotopes Isotopes of Chlorine: 35Cl 37Cl 1717 AM=34.968u AM=36.965u 75.77 % 24.23 % Averaging the masses above you will find the atomic mass of chlorine. LecturePLUS Timberlake

  14. Carbon Dating C-14 The Qin Terracotta Warriors were discovered in China's Shaanxi province near Xi'an in 1974 by six local farmers. The figures were found to be part of a massive burial complex whose construction was ordered by the First Emperor of China, Qin, when he ascended the throne in 246 BC. Carbon dating methods indicate that the ceiling was burned 2200 years ago: C-14

  15. Finding the atomic mass • The atomic mass of an element is found by averaging the individual isotopes considering their abundances. • Atomic Mass of oxygen: • AM=

  16. Calculate the average atomic mass of magnesium using the following data for three magnesium isotopes. Isotope mass (u) abundance(%) Mg-24 23.985 78.70 Mg-25 24.986 10.13 Mg-26 25.983 11.17 AM=

  17. http://dbhs.wvusd.k12.ca.us/webdocs/Mole/AverageAtomicWeight.htmlhttp://dbhs.wvusd.k12.ca.us/webdocs/Mole/AverageAtomicWeight.html

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