Chapter 2: Problem 40
What is an atomic mass unit? Why is it necessary to introduce such a unit?
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Chapter 2: Problem 40
What is an atomic mass unit? Why is it necessary to introduce such a unit?
These are the key concepts you need to understand to accurately answer the question.
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Get started for freeDetermine the mass number of (a) a boron atom with 6 neutrons, (b) a magnesium atom with 13 neutrons, (c) a bromine atom with 44 neutrons, and (d) a mercury atom with 119 neutrons
Group the following elements in pairs that you would expect to show similar chemical properties: \(\mathrm{I}, \mathrm{Ba}, \mathrm{O}, \mathrm{Br}\), \(\mathrm{S}\) and \(\mathrm{Ca}\)
One isotope of a metallic element has mass number 137 and 82 neutrons in the nucleus. The cation derived from the isotope has 54 electrons. Write the chemical symbol for this cation.
A common mineral of barium is barytes, or barium sulfate \(\left(\mathrm{BaSO}_{4}\right) .\) Because elements in the same periodic group have similar chemical properties, we might expect to find some radium sulfate \(\left(\mathrm{RaSO}_{4}\right)\) mixed with barytes because radium is the last member of Group \(2 \mathrm{~A}\). However, the only source of radium compounds in nature is in uranium minerals. Explain why this is so.
For the noble gases (the Group 8 A elements) \({ }_{2}^{4}\) He, \({ }_{10}^{20}\) Ne, \({ }_{18}^{40} \mathrm{Ar},{ }_{36}^{84} \mathrm{Kr},\) and \({ }_{54}^{132} \mathrm{Xe},\) (a) determine the number of protons and neutrons in the nucleus of each atom, and (b) determine the ratio of neutrons to protons in the nucleus of each atom. Describe any general trend you discover in the way this ratio changes with increasing atomic number.
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