1. Substances that have the same electron configuration are: a. isoelectronic. b
ID: 705536 • Letter: 1
Question
1. Substances that have the same electron configuration are: a. isoelectronic. b. lanthanides. c. ferromagnetic. d. paramagnetic. e. diamagnetic.
2 Light has a frequency of 7.21 × 1013 hertz. What is its wavelength? The speed of light is 3.00 × 108 m/s. a. 2.40 × 105 nm b. 4.16 × 103 nm c. 2.40 × 10?4 nm d. 4.16 × 10?6 nm e. 2.16 × 109 nm
3.Which wavelength of light is the fastest? a. 626.1 nm b. 563.8 nm c. 418.6 nm d. 554.9 nm e. All have the same speed.
4. A photon of light has a frequency of 3.26 × 1015 hertz. What is its wavelength? The speed of light is 3.00 × 108 m/s. a. 9.78 × 1014 nm b. 92.0 nm c. 109 nm d. 1.09 × 107 nm e. 978 nm
5.Which element has the largest first ionization energy? a. Sr b. Mg c. Be d. Ba e. Ca
6.Which element has the largest atomic radius? a. H b. He c. F d. Na e. O
7.What is the phenomenon that occurs when certain metals emit electrons when illuminated by particular wavelengths of light? a. electromagnetic spectrum b. quantum theory c. photoelectric effect d. Planck's constant e. emission spectrum
8.Which element has the largest atomic radius? a. Br b. Se c. As d. P e. F
9.Which idea was proposed by Louis de Broglie? a. Energy in the atom is quantized. b. Electrons have clockwise or counter-clockwise spins. c. Small particles, such as electrons, move in waves. d. Excited state orbits have higher energy than ground state orbits. e. Electrons are located in orbits.
10.In a vacuum, all light travels with the same _____________.
11._____________ is how often two successive peaks or troughs in electromagnetic radiation pass per second.
12. Which halogen has the largest ionization energy?
Explanation / Answer
1. a) Isoelectronic
2. ? = C / f = (3*108m/s) / (7.21*1013s-1) = 4.16*10-6m wavelength = 4.16*10-3 nm (option b)
3. e) all have same speed
4. Wavelength = (3*108 m/s) / (3.26*1015s-1) = 9.20*10-8m. Wavelength = 92 nm (option b) ; 1m =1*10-9 nm
5. The elements given in options belong to group II and the first IE decreases from top to bottom of the group. So option c) Be is the correct answer.
6. d) Na has the largest atomic radius.
7. Emission spectrum.
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