Multiple Choice
How many valence electrons does a boron (B) atom have?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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How many electrons occupy the third energy level (n = 3) in a neutral sodium (Na) atom?
A
8
B
11
C
2
D
1
Verified step by step guidance1
Identify the electron configuration of a neutral sodium (Na) atom. Sodium has an atomic number of 11, meaning it has 11 electrons.
Recall that electrons fill energy levels starting from the lowest (n=1) to higher levels following the Aufbau principle.
Write the electron configuration for sodium: the first energy level (n=1) holds 2 electrons, the second energy level (n=2) holds 8 electrons, and the remaining electron goes to the third energy level (n=3).
Count the number of electrons in the third energy level (n=3) based on the electron configuration determined.
Conclude that the number of electrons in the third energy level for sodium is the number of electrons remaining after filling the first two levels.
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