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Chapter 2: Problem 58

a. List the noble gas elements. Which of the noble gases has only radioactive isotopes? (This situation is indicated on most periodic tables by parentheses around the mass of the element. See inside front cover.) b. Which lanthanide element has only radioactive isotopes?

Short Answer

Expert verified
a) The noble gas elements are He, Ne, Ar, Kr, Xe, and Rn. Radon (Rn) has only radioactive isotopes. b) Among the lanthanide elements, promethium (Pm) has only radioactive isotopes.

Step by step solution

01

Locate the noble gases on the periodic table

The noble gases can be found in Group 18 of the periodic table (the last column on the far right).
02

List the noble gas elements

The noble gas elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn).
03

Determine which noble gas has only radioactive isotopes

Check the periodic table for the indication of radioactive isotopes. The element with parentheses around the mass is considered having only radioactive isotopes. In this case, it is radon (Rn). a) The noble gas elements are He, Ne, Ar, Kr, Xe, and Rn. Radon (Rn) has only radioactive isotopes. b) Identifying the lanthanide element with only radioactive isotopes
04

Locate the lanthanide elements on the periodic table

The lanthanide elements can be found in the f-block of the periodic table, which is usually located as a separate row below the main body of the table.
05

Identify the element among the lanthanides with only radioactive isotopes

Check for parentheses around the mass of the lanthanide elements on the periodic table. The element with parentheses around the mass has only radioactive isotopes. In this case, it is promethium (Pm). b) Among the lanthanide elements, promethium (Pm) has only radioactive isotopes.

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Most popular questions from this chapter

You have gone back in time and are working with Dalton on a table of relative masses. Following are his data. 0.602 g gas A reacts with 0.295 g gas \(\mathrm{B}\) 0.172 \(\mathrm{g}\) gas \(\mathrm{B}\) reacts with 0.401 \(\mathrm{g}\) gas \(\mathrm{C}\) 0.320 \(\mathrm{g}\) gas A reacts with 0.374 \(\mathrm{g}\) gas \(\mathrm{C}\) a. Assuming simplest formulas (AB, BC, and AC), construct a table of relative masses for Dalton. b. Knowing some history of chemistry, you tell Dalton that if he determines the volumes of the gases reacted at constant temperature and pressure, he need not assume simplest formulas. You collect the following data: 6 volumes gas \(\mathrm{A}+1\) volume gas \(\mathrm{B} \rightarrow\) 4 volumes product 1 volume gas \(\mathrm{B}+4\) volumes gas \(\mathrm{C} \rightarrow\) 4 volumes product 3 volumes gas \(\mathrm{A}+2\) volumes gas \(\mathrm{C} \rightarrow\) 6 volumes product Write the simplest balanced equations, and find the actual relative masses of the elements. Explain your reasoning.

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