5. Radio Station WTIC AM in Hartford, CT, broadcasts at a frequency of 1080 KiloHz.! a. What is this frequency in Hz?! (1.
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1 Chemistry Worksheet: Light : Chapt 13 : p ! Page 3 1. Arrange the following electromagnetic radiations in order of decreasing wavelength.! (a) Infrared radiation from a heat lamp, (b) ultraviolet radiation from the sun, (c) dental X-rays, (d) the signal from a short wave radio station, (e) green light 2. Arrange the radiation from prob. 1 in order of increasing energy Constants and Equations you will need are on your wave paper. 3. a. What is the wavelength in m of radiation whose frequency is 1.50 x sec 1?! (2.00 x 10 7 m)! b. Convert this wavelength to nm.! (200 nm)! c. In what part of the EM spectrum is this radiation?! d. Does this radiation have a longer or shorter wavelength than red light? 4. What is the frequency of light with a wavelength of 5.20 x 10 7 meters?! (5.77x10 14 Hz)! What color is this light? 5. Radio Station WTIC AM in Hartford, CT, broadcasts at a frequency of 1080 KiloHz.! a. What is this frequency in Hz?! (1.08 x10 6 Hz)! b. What is the wavelength in m of these radio waves?! (278 m) 6. What is the energy of a photon of microwave radiation with frequency = 7.6 x sec 1?!! (5.04 x J) 7. What is the energy of a photon of radiation with a wavelength of 6.0 x 10 5 m? Is this more or less energy than that of Question 6? What part of the EM spectrum is this?! (3.32 x J) 8. What is the energy of a photon of light with a wavelength of 4.5 x 10 2 nm? What part of the EM Spectrum is this photon? (hint: change nm to m first).! (4.42 x10 15 J) 3c. UV; 4. green; 7. IR; 8. X rays
2 s and notations: p ! Page 4 Fill in this chart for the electron configuration of these elements Symbo Atomic Orbital notation N 7 1s 2 2s 2 2p 3! (Superscripts total 7) (7 arrows) 1s! 2s! 2p H 1 He 2 Be 4 C 6 O 8 *Ne 10 Mg 12 [Ne] Al 13 [Ne] P 15 [Ne] *Ar 18 [Ne] 1. How many electrons are in the 2nd energy level of these atoms: (Add 2s and 2p together!)! Be! N! O! Ne! Mg! Ar 2. How many electron pairs ( ) are in these atoms:! Be! N! O! Ne Use the "core method" shortcut for these atoms. Be sure to start with the previous *Noble Gas. Symbo Atomic Orbital notation K 19 [ Ar ] 4s 1 [ Ar ] 4s Ca 20 Sc 21 Cr 24 (exception to usual filling order) Co 27 Br 35
3 s and notations: continued Page 5 Skip the orbital notation for these atoms. Symbo Atomic Symbol Atomic *Kr 36 Er 68 Rb 37 [Kr] Ir 77 Zr 40 Bi 83 Sn 50 *Rn 86 *Xe 54 Ra 88 Ba 56 [Xe] Pu 94 Nd 60 Rf 104 Questions with s Use your answers from above and Page 4 to help you answer Q What is the highest energy level occupied in each of the following? (Short cut: Row on periodic table)! C! P! K! Sc! Br! Rb! Zr! Xe! Nd! Bi 2. How many electrons are in the outside, or highest occupied energy level of the following: (Hint: Add together the highest s and p sublevels!) Example: Kr has 8 (2 in 4s, 6 in 4p)! C! P! K! Sc! Br! Rb! Zr! Xe 3. Which of these has an octet (s 2 p 6 ) as its outer electron configuration?! Mg! Ar! Sc! Kr! Sn! Xe 4. Which of these has its 3rd energy level completely filled? (Hint: 3s 2 3p 6 3d 10 )! P! Ar! Ca! Co! Br! Kr! Rb 5. Which of these has its 4th energy level completely filled? (What sublevels are in 4th level?)! Kr! Sn! Xe! Nd! Er! Ir! Bi 6. Which of these orbital notations is a correct, ground state configuration? What rule do the others violate?! a. c.! 1s! 2s! 2p! 1s! 2s! 2p! b. d.! 1s! 2s! 2p! 1s! 2s! 2p 1) 2, 3, 4, 4, 4, 5, 5, 5, 6, 6; 2) 4, 5, 1, 2, 7, 1, 2, 8; 3) Ar, Kr, Xe (noble gases); 4) Br, Kr, Rb; 5) Ir, Bi; 6) b correct; a& c violate Pauli Prin. ; d violate Hund's rule ; Ans to calculatrivia page 6 : a. 2; b. 1; c. 6; d. 10; e. 23; f. 7; g. 3; h. 9; j. 50; k. 7; m. 3
4 Review questions: Electrons : p ! Page 6 1. What is the wavelength in meters and cm of waves with a frequency of 5 x 10 6 sec 1. What part of the EM spectrum is this?! (60 m, 6000 cm) 2. What is the wavelength and energy of a photon of with a frequency of 5.80 x sec -1?! What color is the photon?! (3.85 x J) 3. Consider the orbital notation for Oxygen:!! 1s! 2s! 2p!! a. The "2" in 2s and 2p stands for the, b. the "p" and "s" stand for the c. the lines above the "2p" stand for the, d. and the arrows. 4. a. Consider the 4th energy level: What sublevels are found there? b. How many orbitals of each type of sublevel are there? c. How many electrons can occupy each of these sublevels? d. How many electrons are needed to completely fill the 4th energy level? 5. Circle the correct filling order for the sublevels for elements in the 4th series (K - Kr).! a. 4s 4p 4d! b. 4s 3p 4d! c. 4s 4d 4p! d. 4s 3d 4p 6. Give the electron configuration (1s 2 ) and orbital notation (arrows) for the following: Boron Sulfur Nickel 3. a=energy level, b=sublevel, c=orbital, d= electrons; 4a. s, p, d, f; b) 1, 3, 5, 7; c) 2, 6, 10, 14; d) 32; 5. d Calculatrivia for electron configurations: Solve the following (ans on bottom page 5) a. Number of 4s electrons in Sc!! b. Number of electrons in H! c. Highest energy level occupied in Neodymium (Nd)! d. Atomic of the lowest element with an octet! e. Atomic weight of element with configuration 1s 2 2s 2 2p 6 3s 1! f. Number of electrons in the highest energy level of Br! g. Number of electron pairs in oxygen! h. Number of orbitals in the entire 3rd energy level! j. Theoretical maximum of electrons in the 5th energy level (2n 2 ) k. Theoretical of sublevels in the 7th energy level! m. Lowest energy level with a d sublevel! Substitute your answers into the following equation. Then show me the element with this atomic! g (( h m ) e ) ( d b) + ( j ( k f )) c a ( )
5 Ans to calculatrivia: a. 2; b. 1; c. 6; d. 10; e. 23; f. 7; g. 3; h. 9; j. 50; k. 7; m. 3 Calculatrivia for electron configurations: Solve the following. a. Number of 4s electrons in Sc!! b. Number of electrons in H! c. Highest energy level occupied in Neodymium (Nd)! d. Atomic of the lowest element with an octet! e. Atomic weight of element with configuration 1s 2 2s 2 2p 6 3s 1! f. Number of electrons in the highest energy level of Br! g. Number of electron pairs in oxygen! h. Number of orbitals in the entire 3rd energy level! j. Theoretical maximum of electrons in the 5th energy level k. Theoretical of sublevels in the 7th energy level! m. Lowest energy level with a d sublevel! Substitute your answers into the following equation. Then show me the element with this atomic! g (( h m ) e ) ( d b) + ( j ( k f )) c a
6 Electrons: Additional Problems 1. The wavelength of green light is about 5.20 x 10 7 meters. What is the frequency of this radiation? 2. What is the energy of a photon of radiation with frequency = 7.5 x 10 7 sec 1? In what part of the electromagnetic spectrum is this radiation located? 3. What is the wavelength of a 9.11x kg electron traveling 3.00 x 10 5 m/sec? l = h! DeBroglie equation: Wavelength of a moving object! mv! (mass in kg, v = velocity of the object in m/sec) x9. What is the wavelength of a 9.11x kg electron traveling 3.00 x 10 5 m/sec? x10. What is the wavelength of a 2500 kg truck traveling at a rate of 75 km/hour? x3. What is the wavelength of a proton (mass = 1.67 x g) moving at a speed of 5.00 x 10 3 m/ sec? (change g to kg) Electrons: Additional Problems 1. The wavelength of green light is about 5.20 x 10 7 meters. What is the frequency of this radiation?
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