The correct electronic configuration of sodium is d) 2, 8, 1.
Explanation:
Sodium (Na) has an atomic number of 11, meaning it has 11 electrons. The electrons are distributed into different energy levels (or shells) around the nucleus. The first shell can hold a maximum of 2 electrons, the second shell can hold a maximum of 8 electrons, and the third shell can hold the remaining electrons. Therefore, the electronic configuration of sodium is 2, 8, 1, where the first shell has 2 electrons, the second shell has 8 electrons, and the third shell has 1 electron.
Key Points:
Atomic number:
Represents the number of protons (and electrons in a neutral atom) in the element’s nucleus.
Electronic configuration:
Describes how electrons are distributed among different energy levels or shells around the nucleus.
Bohr-Bury rule:
This rule provides a simplified model for distributing electrons among shells, although it is not entirely accurate for all elements.