Multiple Choice
How many electrons are present in the outermost shell of a Ga^{3+} ion in its ground state?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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Which of the following elements has more than 2 electrons and a completely filled outermost electron shell?
A
Lithium (Li)
B
Oxygen (O)
C
Neon (Ne)
D
Boron (B)
Verified step by step guidance1
Identify the number of electrons in each element by looking at their atomic numbers: Lithium (3), Oxygen (8), Neon (10), Boron (5).
Determine the electron configuration for each element to understand how their electrons are distributed in shells.
Recall that a completely filled outermost shell means the valence shell has the maximum number of electrons allowed for that shell (e.g., 2 for the first shell, 8 for the second shell).
Check which elements have more than 2 electrons and verify if their outermost shell is fully occupied according to their electron configuration.
Conclude that Neon (Ne), with 10 electrons and a full outer shell of 8 electrons in the second shell, meets the criteria of having more than 2 electrons and a completely filled outermost shell.
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