1. Which of the following element has an average atomic mass that is about ten timesthat of nitrogen?a. Bismuthc. Ceriumb. Indiumd. Lanthanum2. Which of the following statement is TRUE?a. The average atomic mass of an atom is the weighted average of the knownstable isotope of the element.b. The average atomic mass is based on percent isotopic abundance in nature.c. Both A and B.d. None of the choices.

The average atomic mass of an element is the sum all the masses of its isotopes existing in nature ,…

Answered: 1. Which of the following element has…

Introductory Chemistry: A Foundation

9th Edition

ISBN:9781337399425

Author:Steven S. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Donald J. DeCoste

Chapter9: Chemical Quantities

Section: Chapter Questions

Problem 1CR

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An element consists of 1.40% of an isotope with mass 203.973 u, 24.10% of an isotope with mass 205.9745 u, 22.10% of an isotope with mass 206.9759 u, and 52.40% of an isotope with mass 207.Y766 u. Calculate the average atomic mass, and identify the element.
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?
The existence of isotopes violates one of the original ideas of Dalton’s atomic theory. Which one?
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.
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.
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.
Calculating Atomic Mass Magnesium has three naturally occurring isotopes with masses 23.99,24.99,and25.98amu and natural abundances 78.99,10.00,and11.01%. Calculate the atomic mass of magnesium.
In what way are isotopes of a given element always different? In what way(s) are they always the same?
The natural abundances and isotopic masses of the element neon (Ne) are Calculate the atomic mass of naturally occurring neon.
. The elements with atomic numbers of 93 or greater are referred to as the _________ elements.
Dalton’s original atomic theory proposed that all atoms of a given element areidentical. Did this turn out to be true after further experimentation was carried out? Explain.
Questions 31 through 36: Percentage abundances and atomic masses (u) of the natural isotopes of an element are given. a Calculate the atomic mass of each element from these data. b Using other information that is available to you, identify the element. Percentage Abundance Atomic Mass (u) 69.09 62.9298 30.91 64.9278

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1. Which of the following element has an average atomic mass that is about ten times that of nitrogen? a. Bismuth c. Cerium b. Indium d. Lanthanum