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Chapter 2: Problem 53

Assuming that the seventh period of the periodic table has 32 members, what should be the atomic number of (a) the noble gas following radon (Rn); (b) the alkali metal following francium (Fr)?

Short Answer

Expert verified
The atomic number of the noble gas following radon (Rn) is 118 and the atomic number of the alkali metal following francium (Fr) is 119.

Step by step solution

01

Identify the Atomic Numbers of Given Elements

The given elements are Radon (Rn), which is a noble gas and Francium (Fr), an alkali metal. The atomic number of Radon (Rn) is 86 and that of Francium (Fr) is 87.
02

Calculate the Atomic Number of Yet-to-Discover Noble Gas

Knowing that a period on the periodic table consists of 32 elements and that Radon (Rn) is the last element of the 6th period, it can be concluded that the next noble gas will be the last element of the next period. So the atomic number of the noble gas following radon (Rn) would be 86 (Radon’s atomic number) + 32 (Number of elements in a period) = 118.
03

Calculate the Atomic Number of the Alkali Metal

Francium (Fr) is the first element in the 7th period. It's an alkali metal. Therefore, the alkali metal following Francium (Fr) will be the first element in the 8th period. So, the atomic number of the alkali metal following francium (Fr) would be 87 (Francium’s Atomic number) + 32 (Number of elements in a period) = 119.

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