Multiple Choice
Which of the following is the correct electron configuration for sodium (Na)?
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10. Periodic Properties of the Elements
The Electron Configuration
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When an electron moves from the first energy level (n = 1) to the second energy level (n = 2) in an atom, which of the following occurs?
A
The electron's charge increases.
B
The electron absorbs energy.
C
The electron loses mass.
D
The electron emits energy.
Verified step by step guidance1
Understand that electrons in an atom occupy discrete energy levels, labeled by the principal quantum number \( n \).
When an electron moves from a lower energy level (\( n = 1 \)) to a higher energy level (\( n = 2 \)), it must gain energy to overcome the energy difference between these levels.
Recall that energy absorption means the electron takes in energy from an external source, allowing it to move to a higher energy state.
Note that the electron's charge and mass remain constant during this transition; these properties do not change with energy level changes.
Therefore, the correct description of the process is that the electron absorbs energy when moving from \( n = 1 \) to \( n = 2 \).
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