The Aufbau Principle is concerned with what?
The electron configuration of an atom gives the distribution of electrons among atomic orbitals in the atom.
http://en.wikipedia.org/wiki/Aufbau_principle
The Aufbau Principle is a fundamental principle in quantum mechanics that describes the way in which electrons are arranged in an atom. It states that electrons fill atomic orbitals in order of increasing energy, with the lowest energy orbitals being filled first.
To understand the Aufbau Principle, it is important to know about the structure of an atom. Atoms are composed of a nucleus, which contains positively charged protons and neutral neutrons, and negatively charged electrons that orbit around the nucleus in specific energy levels or shells.
To determine the electron configuration and apply the Aufbau Principle, you can use the periodic table. The periodic table provides information about the atomic number and electron configurations of different elements. The atomic number represents the number of protons in the nucleus of an atom, and it determines the element's placement in the periodic table.
Starting with the element at the beginning of the periodic table, hydrogen (H), you can determine the electron configuration by adding one electron to the lowest energy level, which is the first shell. Moving to the next element, helium (He), you add two electrons to the first shell, filling it completely.
Continuing to the next elements, such as lithium (Li), you move to the second shell and add three electrons. Then, beryllium (Be) fills the second shell with four electrons. This trend continues as you move across the periodic table, filling the shells in order of increasing energy until you reach the desired element.
In summary, the Aufbau Principle is concerned with the way electrons fill atomic orbitals, following the order of increasing energy levels and using the electron configuration of elements from the periodic table as a guide.