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Which is the electron configuration for boron?

A. [tex]1s^2 2s^3[/tex]
B. [tex]1s^2 2s^2 3s^1[/tex]
C. [tex]1s^1 2s^2 2p^2[/tex]
D. [tex]1s^2 2s^2 2p^1[/tex]

Sagot :

GinnyAnsweridn
To determine the electron configuration for boron, we need to consider its atomic number, which is 5. This means that a neutral boron atom has 5 electrons. These electrons will fill the available atomic orbitals in the order of increasing energy levels, following the Aufbau principle.

1. The first two electrons will fill the 1s orbital:
- [tex]\(1s^2\)[/tex]

2. The next two electrons will fill the 2s orbital:
- [tex]\(2s^2\)[/tex]

3. The fifth electron will go into one of the 2p orbitals:
- [tex]\(2p^1\)[/tex]

Putting this together, the electron configuration will be:
[tex]\[ 1s^2 \, 2s^2 \, 2p^1 \][/tex]

Thus, the electron configuration for boron is:
[tex]\[ 1s^2 \, 2s^2 \, 2p^1 \][/tex]

So, the correct option is:
[tex]\[ 1s^2 \, 2s^2 \, 2p^1 \][/tex]
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