교과서 질문
Chlorine reacts with oxygen to form Cl2O7 . (d) If the oxygen in Cl2O7 is considered to have the -2 oxidation state, what is the oxidation state of the Cl? What is the electron configuration of Cl in this oxidation state?
10. Periodic Properties of the Elements
The Electron Configuration: Ions
Multiple Choice
What is the electron configuration of the sodium ion (Na+) after it loses an electron?
A
1s² 2s² 2p⁶
B
1s² 2s² 2p⁶ 3p¹
C
1s² 2s² 2p⁵
D
1s² 2s² 2p⁶ 3s¹
검증된 단계별 안내1
Identify the atomic number of sodium (Na), which is 11. This means a neutral sodium atom has 11 electrons.
Write the electron configuration for a neutral sodium atom. The configuration is: 1s² 2s² 2p⁶ 3s¹.
Understand that a sodium ion (Na⁺) is formed when a sodium atom loses one electron.
Remove one electron from the outermost shell of the neutral sodium atom's electron configuration. The outermost electron in sodium is in the 3s orbital.
After removing one electron from the 3s orbital, the electron configuration of the sodium ion (Na⁺) becomes: 1s² 2s² 2p⁶.
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