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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

Which of the following statements is(are) true? For the false statements, correct them. a. Most of the known elements are metals. b. Element 118 should be a nonmetal. c. Hydrogen has mostly metallic properties. d. A family of elements is also known as a period of elements e. When an alkaline earth metal, A, reacts with a halogen, X, the formula of the covalent compound formed should be \(\mathrm{A}_{2} \mathrm{X}\) .

How many protons and neutrons are in the nucleus of each of the following atoms? In a neutral atom of each element, how many electrons are present? a. \(^{79} \mathrm{Br}\) b. \(^{81} \mathrm{Br}\) c. \(^{239} \mathrm{Pu}\) d. \(^{133} \mathrm{Cs}\) e. \(^{3} \mathrm{H}\) f. \(^{56} \mathrm{Fe}\)

What are the symbols for the following nonmetal elements that are most often present in compounds studied in organic chemistry: carbon, hydrogen, oxygen, nitrogen, phosphorus, sulfur? Predict a stable isotope for each of these elements.

Identify the elements that correspond to the following atomic numbers. Label each as either a noble gas, a halogen, an alkali metal, an alkaline earth metal, a transition metal, a lanthanide metal, or an actinide metal. a. 17 b. 4 c. 63 d. 72 e. 2 f. 92 g. 55

Indium oxide contains 4.784 \(\mathrm{g}\) of indium for every 1.000 \(\mathrm{g}\) of oxygen. In \(1869,\) when Mendeleev first presented his version of the periodic table, he proposed the formula \(\operatorname{In}_{2} \mathrm{O}_{3}\) for indium oxide. Before that time it was thought that the formula was InO. What values for the atomic mass of indium are obtained using these two formulas? Assume that oxygen has an atomic mass of 16.00 .
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