Multiple Choice
What is the condensed electron configuration of bismuth (Bi)?
10. Periodic Properties of the Elements
The Electron Configuration
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Which of the following represents the correct electron configuration for helium (He)?
A
1s¹ 2s¹
B
1s² 2s²
C
1s¹ 2p¹
D
1s²
Verified step by step guidance1
Identify the atomic number of helium (He), which is 2. This means helium has 2 electrons.
Recall the order of filling electron orbitals according to the Aufbau principle, which states that electrons fill orbitals starting from the lowest energy level to the highest.
The 1s orbital is the lowest energy level and can hold a maximum of 2 electrons. Therefore, the 2 electrons of helium will fill the 1s orbital.
Write the electron configuration for helium by placing both electrons in the 1s orbital, resulting in 1s².
Verify that the electron configuration 1s² correctly accounts for all 2 electrons of helium, confirming it as the correct configuration.
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