4d there are four types of quantum numbers: 1st: principle quantum number; relates to which electron shell your election is. its symbol is n, and it can be any number like 1,2,3,4....etc. here, n = 4. 2nd: azimuthal; gives the orbital angular momentum which specifies the shape of the orbital you're talking about. its symbol is lower-case L, or l, and can be any number from 0 up until one less than your n value. here, because n=4, l can be 0,1,2 or 3, corresponding to s,p,d or f orbitals respectively (you just have to memorize that part). so here, because it's 4d, and d corresponds to l = 2, our azimuthal quantum number here is l = 2. 3rd: magnetic; determines which one of the set of orbitals you're talking about. its symbol is ml. this can be anything from -l up to +l. here, because l is 2, we know that ml can be -2, -1, 0, +1, or +2. this makes sense because we know there are 5 types of d-orbitals. however, we don't have enough information to determine what ml is here of those five. (another example to think about - how many p-orbitals are there? a chem textbook will tell you there are three, and draw them all pointing different directions - px, py, pz. the azimuthal quantum number l for p-orbitals is 1. so ml can be -1, 0, or +1 = three different types. the math works out!) 4th: spin quantum number; tells whether the electron you're talking about is in spin-down or spin-up configuration. its symbol is ms. this number can always be either -1/2 or +1/2. again, you don't know which one you're talking about here - you don't have enough information. hope that helps!
using contraction and expansion
electrical engineers and quantum mechanics use them.
Molecular biology, quantum physics, cosmology and physical chemistry are four examples.
We can think time as a 4D object, but we cannot visualize so easily a 4D object. But surely we know that a 4D object cannot live inside the 4D space, it will live in the 5th dimension space. We know that we can calculate the hyper-volumes by using integration (in our case) over a R4 domain which is not so easy to be visualize also. For example by hand we can construct a R3domain by using the xyz-coordinate system.
It is the total of those numbers divided by four.
A 4d electron; that is for apex :)
All four quantum numbers i.e principle ,azimuthal or subsidiary, magnetic and spin quantum numbers are required to specify a single atomic orbital.
How are electrons arranged in the quantum mechanical model of an atom
The four quantum numbers, n, l, m1, and ms, are all solutions to Schrödinger's equation. These numbers are used to assign each electron in an atom an "address." They "uniquely characterize an electron and its state in an atom" ("Quantum Number").
These are: principal quantum number (n), azimutal quantum number (ł), magnetic quantum number (m), spin quantum number (sd).
What are the quantum numbers of Br?
Four quantum numbers are used to describe electrons in atoms.
There can be two electrons with those quantum numbers in an atom. Each electron is completely described by four quantum numbers. The one that's missing in the list provided is ms, which can have only two possible values (+1/2 and -1/2).
The specific orbital within a sublevel- apex
n (principle quantum number) = 4 l (angular momentum quantum number) = 2 ml (magnetic quantum number) = -2, -1, 0, 1, or 2 ms (spin quantum number) = +1/2 or -1/2
Four quantum numbers are used to describe electrons. The principle quantum number is the energy level of an electron. The angular momentum number is the shape of the orbital holding the electron. The magnetic quantum number is the position of an orbital holding an electron. The spin quantum number is the spin of an electron.
4D shapes are shapes in four dimensional space. Since we live in 3D space it is very difficult for most people to visualise 4D shapes.