Which element has the electron configuration 2 3?
Which element has the electron configuration 2 3?
| Element | Atomic number | Electron configuration |
|---|---|---|
| helium | 2 | 1s2 |
| lithium | 3 | 1s22s1 |
| beryllium | 4 | 1s22s2 |
| boron | 5 | 1s22s22p1 |
How many orbitals are in a shell?
The number of orbitals in a shell is the square of the principal quantum number: 12 = 1, 22 = 4, 32 = 9. There is one orbital in an s subshell (l = 0), three orbitals in a p subshell (l = 1), and five orbitals in a d subshell (l = 2). The number of orbitals in a subshell is therefore 2(l) + 1.
Do all subshells in a shell have the same energy?
In a hydrogen atom, all the subshells in a shell have the same energy. This gives the maximum number of electrons in each shell as 2, 8, 18, 32, 50. In atoms with more than one electron, the energies of the subshells change because of repulsions between the electrons.
What is the difference between an electron shell and an electron orbital?
Electron shells consist of one or more subshells, and subshells consist of one or more atomic orbitals. Electrons in the same subshell have the same energy, while electrons in different shells or subshells have different energies.
Why do electron shells get closer together?
The energy levels in an atom are similar to the rungs of a ladder, but they get closer together as they get farther from the nucleus. For an electron to move from one energy level to the next higher level, it must gain the right amount of energy.
Do electrons carry mass?
Electrons belong to the first generation of the lepton particle family, and are generally thought to be elementary particles because they have no known components or substructure. The electron has a mass that is approximately 1/1836 that of the proton.
Do electrons affect atomic mass?
Electrons are much smaller in mass than protons, weighing only 9.11 × 10-28 grams, or about 1/1800 of an atomic mass unit. Therefore, they do not contribute much to an element’s overall atomic mass. Protons, neutrons, and electrons: Both protons and neutrons have a mass of 1 amu and are found in the nucleus.