29. This was the first model of the atom ever proposed. It was simple and described atoms as tiny spheres that could not be broken down into smaller pieces. a. Democritus's model of the atom b. The "Rutherford Model" of the atom C. The "Plum Pudding Model" of the atom d. The "Quantum Mechanical Model" of the atom 30. An atom has a mass number of 23 and atomic number 11. The number of protons are, а. 11 b. 12 С. 23 d. 44 31. What is the mass number of an atom which contains 28 protons, 28 electrons, and 34 neutrons? * а. 28 b. 56 С. 62 d. 90 32. What is the atomic number of an atom with 6 protons and 6 neutrons? * а. О b. 6 C. 12 d. 36 33. Element X has 19 protons and 20 neutrons while element Y has 19 protons and 21 neutrons. What can you say about these elements? * a. They are different elements b. They are identical elements C. Element X is an isotope of element Y. d. They have the same mass and atomic number

29. This was the first model of the atom ever proposed. It was simple and described atoms as tiny spheres that could not be broken down into smaller pieces. a. Democritus's model of the atom b. The "Rutherford Model" of the atom C. The "Plum Pudding Model" of the atom d. The "Quantum Mechanical Model" of the atom 30. An atom has a mass number of 23 and atomic number 11. The number of protons are, а. 11 b. 12 С. 23 d. 44 31. What is the mass number of an atom which contains 28 protons, 28 electrons, and 34 neutrons? * а. 28 b. 56 С. 62 d. 90 32. What is the atomic number of an atom with 6 protons and 6 neutrons? * а. О b. 6 C. 12 d. 36 33. Element X has 19 protons and 20 neutrons while element Y has 19 protons and 21 neutrons. What can you say about these elements? * a. They are different elements b. They are identical elements C. Element X is an isotope of element Y. d. They have the same mass and atomic number

Living by Chemistry

2nd Edition

ISBN:9781464142314

Author:Angelica M. Stacy

Publisher:Angelica M. Stacy

ChapterU1: Alchemy: Matter, Atomic Structure, And Bonding

Section: Chapter Questions

Problem 3STP

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Your friend tells you about an article that he read in a tabloid that reported the discovery of a new form of carbon containing eight protons in the nucleus of its atoms. He claims that scientists are eager to explore the properties of this new form of carbon. What is wrong with the tabloid's claim? a. Nothing. The claim is believable. b. The claim must be false because an atom with eight protons would be oxygen, which is already known. c. The claim must be false because all forms of carbon are already known.
Do the proton and the neutron have exactly the same mass? How do the masses of the proton and the neutron compare to the mass of the electron? Which particles make the greatest contribution W the mass of an atom? Which particles make the greatest contribution to the chemical properties of an atom?
Consider Ernest Rutherfords -particle bombardment experiment illustrated in Fig. 2.12. How did the results of this experiment lead Rutherford away from the plum pudding model of the atom to propose the nuclear model of the atom?
One of the best indications of a useful theory is that it raises more questions for further experimentation than it originally answered. Does this apply to Daltons atomic theory? Give examples.
Predict and test the behavior of a particles fired at a Rutherford atom model. Predict the paths taken by a particles that are fired at atoms with a Rutherford atom model structure. Explain why you expect the particles to take these paths. If a particles of higher energy than those in (a) are fired at Rutherford atoms, predict how their paths will differ from the lower-energy a particle paths. Explain your reasoning. Predict how the paths taken by the particles will differ if they are fired at Rutherford atoms of elements other than gold. What factor do you expect to cause this difference in paths, and why? Now test your predictions from (a), (b), and (c). Open the Rutherford Scattering simulation (http://openstaxcollege.org/I/16PhetScatter) and select the Rutherford Atom tab. Due to the scale of the simulation, it is best to start with a small nucleus, so select 20 for both protons and neutrons, mm for energy, show traces, and then start firing a particles. Does this match your prediction from (a)? If not, explain why the actual path would be that shown in the simulation. Pause or reset, set energy to max, and start firing a particles. Does this match your prediction from (b)? If not, explain the effect of increased energy on the actual path as shown in the simulation. Pause or reset, select 40 for both protons and neutrons, mm for energy, show traces, and fire away. Does this match your prediction from (c)? If not, explain why the actual path would be that shown in the simulation. Repeat this with larger numbers of protons and neutrons. What generalization can you make regarding the type of atom and effect on the path of a particles? Be clear and specific.
A fundamental idea of Daltons atomic theory is that atoms of an element can be neither created nor destroyed. We now know that this is not always true. Specifically, it is not true for uranium and lead atoms as they appear in nature. Are the numbers of these atoms increasing or decreasing? Explain.
The Rutherford experiment was performed and its conclusions reached before protons and neutrons were discovered. When they were found, why was it believed that they were in the nucleus of the atom?
Atoms are electrically neutral. This means that an atom will contain a.more protons than neutrons. b.more electrons than protons. c.an equal number of protons and electrons. d.None of the above.
Who discovered the electron? Describe the experiment that led to the deduction that electrons are negatively charged particles.
According to Rutherfords model of the atom, how many electrons would be found in each of the following atoms? a. sodium, which has 11 protons in its nucleus b. calcium, which has 20 protons in its nucleus
In Section 1.1 of the text, the concept of a chemical reaction was introduced with the example of the decomposition of water, represented as follows: Use ideas from Dalton's atomic theory to explain how the above representation illustrates the law of conservation of mass.