The electronic configuration 2, 8, 1 represents the arrangement of electrons in the shells of an atom. The first shell can hold a maximum of two electrons, the second shell can hold up to eight, and the third shell can hold up to eighteen. The given configuration indicates two electrons in the first shell, eight in the second shell, and one electron in the third shell. This means the element has a total of 11 electrons.
Since the number of electrons is equal to the atomic number in a neutral atom, we are looking for an element with an atomic number of 11. Let's examine the options:
- Chlorine: Chlorine has an atomic number of 17, with an electron configuration of 2, 8, 7.
- Hydrogen: Hydrogen has an atomic number of 1, with an electron configuration of 1.
- Magnesium: Magnesium has an atomic number of 12, with an electron configuration of 2, 8, 2.
- Sodium: Sodium has an atomic number of 11, and its electron configuration is 2, 8, 1. This matches the given configuration.
Therefore, the element with the electronic configuration 2, 8, 1 is Sodium.
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