44. Elements belonging to the same period have * a. The same number of electrons b. The same number of protons C. The same number of neutrons d. The electrons occupy the same number of energy levels 45. Which of the following forms the basis of the modern periodic table? * a. atomic mass b. atomic number C. number of nucleons d. none of these

44. Elements belonging to the same period have * a. The same number of electrons b. The same number of protons C. The same number of neutrons d. The electrons occupy the same number of energy levels 45. Which of the following forms the basis of the modern periodic table? * a. atomic mass b. atomic number C. number of nucleons d. none of these

Chemistry: Matter and Change

1st Edition

ISBN:9780078746376

Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Chapter4: The Structure Of The Atom

Section: Chapter Questions

Problem 97A

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Similar questions

The existence of isotopes violates one of the original ideas of Dalton’s atomic theory. Which one?
. The elements with atomic numbers of 93 or greater are referred to as the _________ elements.
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.
An atom that has lost three electrons will have a charge of .
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.
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.
In what way are isotopes of a given element always different? In what way(s) are they always the same?
Scientists J. J. Thomson and William Thomson (Lord Kelvin) made numerous contributions to our understanding of the atom’s structure. Which subatomic particle did J. J. Thomson discover, and what did this lead him to postulate about the nature of the atom? William Thomson postulated what became known as the “plum pudding” model of the atom’s structure. What did this model suggest?
How would you expect the chemical properties of isotopes of the same element to compare to each other? Explain your answer.
The contributions of J. J. Thomson and Ernest Rutherford led the way to todays understanding of the structure of the atom. What were their contributions?
It is good practice to actively read the textbook and to try to verify claims that are made when you can. The following claim is made in your textbook: “. . . if the nucleus were the size of a grape, the electrons would be about 1 mile away on average.” Provide mathematical support for this statement.
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?