53.The atomic mass of an element is the ____.a.total number of subatomic particles in its nucleusb.weighted average of the masses of the isotopes of the elementc.total mass of the isotopes of the elementd.average of the mass number and the atomic number for the element____54.The atomic mass of an element depends upon the ____.____55.Which of the following is necessary to calculate the atomic mass of an element?Short Answer56.List the number of protons, neutrons, and electrons in 56.List the number of protons, neutrons, and electrons in C.57.Chlorine has two naturally occurring isotopes, Cl-35 and Cl-37. The atomic mass of chlorine is 35.45. Which of these two isotopes of chlorine is more abundant?58.Consider an element Z that has two naturally occurring isotopes with the following percent abundances: the isotope with a mass number of 19.0 is 55.0% abundant; the isotope with a mass number of 21.0 is 45.0% abundant. What is the average atomic mass for element Z?, 20.0 percent of the isotope , and 70.0 percent of the isotope . Estimate the atomic mass of element X.
60.The element chromium has four naturally occurring isotopes. Use the relative abundance of each to calculate the average atomic mass of chromium.Cr = 4.34%, Cr = 83.79%, Cr = 9.50%, Cr = 2.37%.Numeric Response61.What is the relative charge carried by an electron?62.What is the relative charge of a proton?63.About how many more times massive is a proton than an electron?64.Use the periodic table to determine the number of electrons in a neutral atom of lithium.65.Use the periodic table to determine the number of protons in an atom of barium.66.How many protons are present in an atom of Be-9?67.What is the total number of subatomic particles in the nucleus of an atom of Bi?68.Determine the number of electrons in an atom of iridium.69.What is the atomic number for an element with 41 neutrons and a mass number of 80?70.How many electrons are in an atom of gold?71.What is the mass number for an oxygen atom that has 10 neutrons in its nucleus?72.How many protons are present in the nuclei of the three known isotopes of hydrogen?73.Use the periodic table to determine the number of neutrons in nitrogen-14.74.How many neutrons are present in an atom of the isotope U?75.Calculate the number of neutrons in Pb.Essay76.Explain how Dalton improved upon atomic theory more than 2000 years after Democritus’s hypotheses about atoms.77.Explain how electron microscopy and scanning tunneling microscopes have contributed to the understanding of atoms.78.What observations by Rutherford led to the hypothesis that atoms are mostly empty space, and that almost all of the mass of the atom is contained in an atomic nucleus?79.Explain how the atoms of one element differ from those of another element.80.In what way are two isotopes of the same element different? Explain why isotopes of the same element have the same chemical behavior.
You've reached the end of your free preview.
Want to read all 7 pages?