Multiple Choice
Which of the following element symbols correctly represents the element with atomic number 8 on the periodic table?
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2. Atoms & Elements
Periodic Table: Element Symbols
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In noble gas notation, the symbol Xe is used to represent the electron configuration of which element as its core?
A
Krypton
B
Argon
C
Radon
D
Neon
Verified step by step guidance1
Understand that noble gas notation uses the electron configuration of a noble gas as a shorthand to represent the core electrons of an element.
Recall the noble gases and their symbols along with their atomic numbers: Neon (Ne, 10), Argon (Ar, 18), Krypton (Kr, 36), Xenon (Xe, 54), and Radon (Rn, 86).
Recognize that the symbol Xe represents the electron configuration of Xenon, which has 54 electrons, and is used as the core configuration for elements with atomic numbers greater than 54.
Identify that Radon (Rn) has an atomic number of 86, which is greater than 54, so its electron configuration can be written using Xe as the core noble gas notation.
Conclude that the noble gas notation using Xe as the core corresponds to elements beyond Xenon, such as Radon, making Radon the correct answer.
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