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Chapter 9: Problem 7

Assuming that the seventh period is 32 members long, what should be the atomic number of the noble gas following radon (Rn)? Of the alkali metal following francium (Fr)? What would you expect their approximate atomic masses to be?

Short Answer

Expert verified
The atomic number of the noble gas following radon (Rn) should be 118, and the alkali metal following francium (Fr) should be 119. Their approximate atomic masses can be expected to be slightly more than that of Radon and Francium respectively, around or slightly above 223 u and 222 u.

Step by step solution

01

Identify the current Noble gas and Alkali Metal

Identify the position of Radon (Rn) and Francium (Fr). Radon, the Noble gas has an atomic number of 86, and Francium, the Alkali metal, begins the seventh period with an atomic number of 87.
02

Predicting the Next Noble Gas and Alkali Metal

Observe that noble gases appear at the end of each period and alkali metals appear at the beginning. Thus, the next noble gas after Radon should be the 32nd element of the 7th period, which is atomic number 118. The next alkali metal after Francium should be the first element of the 8th period, which is atomic number 119.
03

Estimating Atomic Masses

Knowing there is a direct relationship between the atomic number and atomic weight, we can expect the atomic weight to increase. However, accurate predictions are challenging due to factors like isotopic abundance and nuclear binding energy. Assuming a standard increase, the atomic weight of the next Noble gas may be slightly more than Radon's (222 u), and the alkali metal following Francium may be slightly more than Francium's (223 u).

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Most popular questions from this chapter

Among the following ions, several pairs are isoelectronic. Identify these pairs. \(\mathrm{Fe}^{2+}, \mathrm{Sc}^{3+}, \mathrm{Ca}^{2+}, \mathrm{F}^{-}\) \(\mathrm{Co}^{2+}, \mathrm{Co}^{3+}, \mathrm{Sr}^{2+}, \mathrm{Cu}^{+}, \mathrm{Zn}^{2+}, \mathrm{Al}^{3+}.\)

Mendeleev's periodic table did not preclude the possibility of a new group of elements that would fit within the existing table, as was the case with the noble gases. Moseley's work did preclude this possibility. Explain this difference.

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