Write the quantum number of last electron in Ne atom
Answers
Explanation:
There are four quantum numbers: n, ℓ, mℓ, and ms. Each one is a particular factor in an equation describing a property of the electron. At this introductory level, the equations are not needed. The value of each quantum number is assigned to each electron in an atom by a "building up" process. Niels Bohr called this process the "Aufbau" principle: aufbau means "building up."
n is ALWAYS the starting point for building up a series of quantum numbers. Each quantum number is then assigned according to a set of rules, each of which took years of study to finally determine. The rules ARE NOT just any old arbitrary ones; they have been determined from a study of nature. Remember the rules:
(1) n = 1, 2, 3, and so on.
(2) ℓ = 0, 1, 2, . . . , n - 1
(3) mℓ starts at negative ℓ, runs by whole numbers to zero and then goes to positive ℓ.
(4) after the n, ℓ and mℓ to be used have been determined, assign the ms value +½ to one electron, then assign the ms value of -½ to the next electron, while using the same n, ℓ and m values.
Also, keep in mind that we use only one n, ℓ, mℓ, and ms value each to make a set of four quantum numbers for each electron. It is this set of four quantum numbers that uniquely identifies each electron.
Last point: the last column in each table below is called "Orbital Name." As you are reading this tutorial, you may not yet know what an orbital is. That's OK, but please understand the concept called "orbital" is an important one. Here's a real simple description that ignores lots of details: each orbital is a region of space around the nucleus which contains a MAXIMUM of two electrons. Realize that it's more complex than that, but the above description is good enough for now. I hope!!
Hydrogen - one electron
First Electron
n = 1
ℓ = 0
mℓ = 0
In each case, note that we start with the smallest value of n, ℓ, or mℓ possible. Make sure you look over the rules to see how each value was arrived at. ℓ starts at zero and goes to n - 1, which is zero since we get 1 - 1 = 0, when using n = 1. When ℓ = 0, there is only one possible choice for mℓ, which must be zero.
ms = +½
This completes the four quantum numbers for the single electron possessed by hydrogen. I shall build up a table like this: