4s4p什麼意思

"4s4p" is a notation used in chemistry to describe the electronic configuration of an atom. It refers to the filling of electron orbitals in the atomic structure.

Here's what each part of the notation means:

• "4s" refers to the 4s orbital, which is the orbital with the lowest energy vacancy in the n=4 shell (also known as the fourth principal energy level). Electrons fill this orbital before moving on to higher energy orbitals.

• "4p" refers to the 4p orbital, which is the next orbital in the n=4 shell with a higher energy than the 4s orbital. Electrons fill this orbital after the 4s orbital is full.

The "4s4p" configuration typically applies to elements in the fourth row of the periodic table, such as the transition metals and some of the elements in the second and third periods (rows). For example, the element scandium (Sc) has an atomic number of 21 and its electron configuration is [Ar] 4s2 3d1, where the "4s" and "3d" parts indicate that scandium has partially filled 4s and 3d orbitals.

In the context of batteries, "4s4p" might refer to a battery configuration where "4s" means four cells in series and "4p" means four sets of parallel connections. This would result in a battery pack with 16 cells (4 sets of 4 cells in parallel) connected in series.