Multiple Choice
How many valence electrons does an atom of neon (Ne) have?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following elements has exactly two electron shells?
A
Neon (Ne)
B
Hydrogen (H)
C
Sodium (Na)
D
Lithium (Li)
Verified step by step guidance1
Recall that the number of electron shells in an element corresponds to the period (row) of the element in the periodic table. Each period adds a new electron shell.
Identify the period number for each element: Hydrogen (H) is in period 1, Lithium (Li) is in period 2, Neon (Ne) is in period 2, and Sodium (Na) is in period 3.
Since elements in period 2 have exactly two electron shells, focus on Lithium (Li) and Neon (Ne) as candidates.
Consider the electron configuration of Neon (Ne), which is $1s^2 2s^2 2p^6$, showing electrons occupy only the first and second shells.
Confirm that Neon (Ne) has exactly two electron shells, while Lithium (Li) also has two shells but fewer electrons; Neon is a noble gas with a full second shell, making it a clear example of an element with exactly two electron shells.
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