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Which is the electron configuration for lithium?

A. \(1s^2\)
B. \(2s^3\)
C. \(1s^2 2s^1\)
D. [tex]\(1s^1 2s^2\)[/tex]

Sagot :

GinnyAnswer
To determine the electron configuration of lithium, we should consider its atomic number and the arrangement of electrons in different energy levels.

1. Identify the atomic number of lithium: Lithium has an atomic number of 3. This means it has 3 electrons.

2. Distribute the electrons into different energy levels:
- The first energy level (shell) can hold up to 2 electrons.
- Hence, we place the first 2 electrons in the 1s orbital: \(1s^2\).
- The second energy level can hold up to 8 electrons, but since we only have 1 electron left, it goes into the 2s orbital: \(2s^1\).

Putting it all together, the electron configuration of lithium is:
[tex]\[ 1s^2 2s^1 \][/tex]

So, the correct answer is [tex]\( 1s^2 2s^1 \)[/tex].
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