Learning Targets - New Smyrna Beach High School
Name:___[KEY]____________________Date:___________Period:____Review Pre-AP ChemistryUnit 3: Electrons and Modern Atomic Theory1. Rank the following electromagnetic waves from 1 to 7, with 1 as the lowest value and 7 as the highest value. Rank them in each of the four categories listed.Energy(1 thru 7)Frequency(1 thru 7)Wavelength(1 thru 7)Wave Speed(1 thru 7)visible light4443.00 x 108X-rays662=infrared light335=radio waves117=gamma rays771=microwaves226=UV light553=Figure 1:Bohr Model GNucleus E2. Examine the Bohr Model of a hydrogen atom in Figure 1. Place a “G” in the box that points to the “Ground State” electron energy level.Place an “E” in the box that points to the “Excited State” electron energy level.How is the “excited state” different from the“ground state?” _an electron in the “excited” state has a higher energy than the “ground” state??E)E initial level 5photonEfinale-level 2e-Figure 2 B:electron move from low to high level??E)Efinal level 3photonEinitiale-level 1Figure 2 A:electron move from high to low levelEinitiale-3. Study Figures 2A and 2B.In which figure is energy absorbed? A or BHow do you know? _energy is absorbed to separate an electron (move further) from the nucleusIn which figure is energy emitted? A or BHow do you know? _energy is emitted when an electron moves closer to the nucleusWhich figure shows a photon of the greatest energy? A or BHow do you know? _greater change in energy levels (3 levels from 5 to 2)______________4. What is the term for an electron’s lowest possible energy in an atom? _ground state____5. What is a VALENCE ELECTRON? _an electron in the outer-most (highest) energy level of an atom6. Write the number of valence electrons for the elements in each group in the boxes below.876543217. Complete the table.ElementSymbol# of VALENCE ElectronsElectron ConfigurationLewis Dot DiagramBohr ModelargonAr81s2 2s2 2p6 3s2 3p6ArnitrogenN51s2 2s2 2p3 NbromineBr71s22s22p63s23p64s23d104p5BrmanganeseMn2[Ar] 4s2 3d5Mn8. Identify the s, p, d and f regions on the periodic tablepsby writing the correct letter on the table below in the correct block (or area).df9. Draw lines to match the each atomic orbital shape to the letter that represents it:915670152400s10928352315210713105145415pfd79565546355010. Which of the following quantum leaps by an electron would be associated with the greatest energy of absorbed light by an atom?A. level 1 to level 4B. level 5 to level 2C. level 2 to level 4D. level 6 to level 311. Which orbital notation below represents an atom with four valence electrons?12. Which of these two colors has a higher FREQUENCY?Redor Blue 13. Which of these two colors has a longer WAVELENGTH?Redor Blue 14. TRUE or FALSE: The greater the energy of an EM wave, the higher the frequency and the shorter the wavelength.If false, write a corrected statement: _________________________________________________________________________________________________________________________bluegreenvioletredvioletpurple colored light from electrified hydrogen gasgreenbluered15. The figure above shows the hydrogen emission spectrum studied by physicist Niels Bohr. What evidence led Bohr to theorize that electrons exist only in specific energy levels in atoms?Only specific wavelengths (frequencies/energies) of light were emitted by electrons that must have transitioned between specific energy levels within the atom.16. Briefly describe Bohr’s model of the atom including discussion of all subatomic particles and their locations within the atom:Electrons orbit the central, positive nucleus (containing protons & neutrons) inspecific energy levels of fixed energy.17. Compare and contrast Bohr’s atomic model to Rutherford’s.How are they SIMILAR? Both describe electrons located around a central, positive nucleusHow are they DIFFERENT? Bohr describes the electrons in specific energy levels18. Briefly describe the Quantum Mechanical model of the atom including discussion of all subatomic particles and their locations within the atom:The locations of electrons are described by probability in 3-dimensional regions of space (orbitals) around the central, positive nucleus (containing protons & neutrons).19. Cross out any part of the following statement that is FALSE:In the Quantum Mechanical model, electrons are spread throughout a fuzzy cloud around the nucleus so nothing can be known about the location of each electron.Write a corrected statement:The locations of electrons can be estimated by probability and limited to 3-dimensional regions of space (orbitals) within the energy levels around the nucleus.For #20-22, consider the following equations and constants:c = ??c = 3.00 x 108 m/sE = h?h = 6.63 x 10–34 J?s (3.00 x 108) = λ (3.50 x 109)λ = 0.0857 m20. What is the wavelength of infrared light with a frequency of 3.50 x 109 Hz? c = λn(3.00 x 108) = λ (3.50 x 109)E = (6.63 x 10–34) (6.30 x 1014)E = 4.18 x 10–19 J21. What is the energy of blue light with a frequency of 6.30 x 1014 Hz? E = hn22. What is the energy of an x-ray with a wavelength of 3.30 x 10–10 m? ................
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