1. List the two postulates of Dalton's atomic theory which are inconsistent in the modern atomic theory. 2. List the major properties of cathode rays. 3. List and explain the three... 1. List the two postulates of Dalton's atomic theory which are inconsistent in the modern atomic theory. 2. List the major properties of cathode rays. 3. List and explain the three types of radiation during radioactive decay. 4. The mass-to-charge ratio of the proton is found to be 1.602x10^-19 C. Calculate the mass of the proton. 5. What is radioactivity? Who discovered it? 6. Given: ^{79}_{35}Br Deduce the number of protons, electrons, neutrons. 7. What are isotopes? Explain briefly. 8. Explain the limitations of the Bohr's Model. 9. Calculate the energy, in joules, of a photon of red light that has a frequency of 3.73x10^{14} s^{-1}. 10. Electrons have an associated wave length of 84.4nm. At what speed, in meters per second, are the electrons traveling? 11. Calculate the wave length, in nanometers, associated with a proton traveling at a speed of 2.55x10^{6} m/s? (Use 1.67 Kg as the proton mass)
Understand the Problem
The question is asking to answer a series of short and brief questions related to atomic theory, properties of radiation, radioactivity, isotopes, and calculations involving energy and wavelength in the context of physics and chemistry.
Answer
1. Atoms indivisible and identical. 2. Negative charge, straight lines. 3. Alpha, beta, gamma. 4. 1.673 x 10^-27 kg. 5. By Becquerel. 6. 35p, 35e, 44n. 7. Same protons, diff neutrons. 8. Not for multi-electron atoms. 9. 2.47 x 10^-19 J. 10. 8.43 x 10^6 m/s. 11. 1.56 nm.
- Atoms are indivisible and identical. 2. Cathode rays are negatively charged, travel in straight lines, and cause fluorescence. 3. Alpha, beta, gamma radiation. 4. Mass = 1.673 x 10^-27 kg. 5. Radioactivity is spontaneous emission of particles/rays from unstable nuclei, discovered by Henri Becquerel. 6. Protons: 35, Electrons: 35, Neutrons: 44. 7. Isotopes have the same protons, different neutrons. 8. Bohr's Model doesn't work for multi-electron atoms. 9. Energy = 2.47 x 10^-19 J. 10. Speed = 8.43 x 10^6 m/s. 11. Wavelength = 1.56 nm.
Answer for screen readers
- Atoms are indivisible and identical. 2. Cathode rays are negatively charged, travel in straight lines, and cause fluorescence. 3. Alpha, beta, gamma radiation. 4. Mass = 1.673 x 10^-27 kg. 5. Radioactivity is spontaneous emission of particles/rays from unstable nuclei, discovered by Henri Becquerel. 6. Protons: 35, Electrons: 35, Neutrons: 44. 7. Isotopes have the same protons, different neutrons. 8. Bohr's Model doesn't work for multi-electron atoms. 9. Energy = 2.47 x 10^-19 J. 10. Speed = 8.43 x 10^6 m/s. 11. Wavelength = 1.56 nm.
More Information
Dalton's theory was a significant stepping stone in understanding atomic structure despite its limitations.
Tips
A common mistake is forgetting that Bohr's model is limited to hydrogen-like atoms. In isotopes, remember the number of protons is constant.
Sources
- Postulates of Dalton's Atomic Theory - Chemistry LibreTexts - chem.libretexts.org
- Atomic Structure - Cathode Rays and Radioactivity - Turito - turito.com
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