Multiple Choice
Which of the following is the correct electron configuration for tungsten (W)?
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10. Periodic Properties of the Elements
The Electron Configuration
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Which of the following is the correct orbital notation for boron (atomic number 5)?
A
1s^2 2s^1 2p^2
B
1s^2 2s^2 2p^1
C
1s^2 2s^1 2p^3
D
1s^2 2s^2 2p^3
Verified step by step guidance1
Step 1: Identify the atomic number of boron, which is 5. This means boron has 5 electrons to place in orbitals according to the Aufbau principle.
Step 2: Fill the orbitals in order of increasing energy: first the 1s orbital, then the 2s orbital, and finally the 2p orbitals. Each orbital can hold a maximum of 2 electrons.
Step 3: Place 2 electrons in the 1s orbital, filling it completely: $1s^{2}$.
Step 4: Place the next 2 electrons in the 2s orbital, filling it completely: $2s^{2}$.
Step 5: Place the remaining 1 electron in the 2p orbital: $2p^{1}$. This gives the correct electron configuration for boron as $1s^{2} 2s^{2} 2p^{1}$.
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