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In chemistry and atomic physics, an electron shell may be thought of as an orbit that electrons follow around an atom's nucleus. The closest shell to the nucleus is called the "1 shell" (also called the "K shell"), followed by the "2 shell" (or "L shell"), then the "3 shell" (or "M shell"), and so on farther and farther from the nucleus.
Electron shell, regions surrounding the atomic nucleus containing a specific number of electrons. Each allowed electron orbit is assigned a quantum number n that runs from 1 (for the orbit closest to the nucleus) to infinity (for orbits very far from the nucleus).
- The Editors of Encyclopaedia Britannica
The 1s is the first orbital electron shell and it is closest to the nucleus. The 2n is the second shell. It consists of the 2s and 2p shells. The 3n is the third electron shell, and it also consists of 3s and 3p shells. The number after it stands for the amount of electrons in each orbital.
- If the Bohr model is an inaccurate representation of electron's movement, why is it so universally a...Because in Bohr’s model for hydrogen atom we consider only Coulombic interactions between one proton and one electron. It cannot be extended for ot...
- I'm kinda also confused on what an electron shell is and what an electron subshell is. Is the elctro...All atoms are made up of energy levels (called shells) that hold 1 or more subshells. Each subshell holds a certain type of orbit. Each individual...
- How can you determine the number of outer shell electrons based on the full electron configuration?I'll try to explain with the help of an example. Consider Sodium (Na) Its electronic configuration is 1s2, 2s2, 2p6, 3s1 The largest value of the P...
- In the second last paragraph, I don't really get why because of the d subshell having more energy, a...I am not sure where the confusion is. Argon has a full outer shell of electrons already. It will not have a d-subshell
- How do scientists figure this out? Do we have microscopes powerful enough to view atoms and observe ...No, it can't be figured out using microscopes. Most of it is based on theory worked out using a lot of maths. Experimental observations, such as th...
- How much space does electrons take upOverall, the electrons are much smaller than the protons and neutrons. But, they take up more space when you think about how they move. They are co...
- Can Hydrogen lose its only valence electron? Can an element exist without electrons?Hydrogen can lose its one electron and became an ion, or the hydrogen cation H^(+). However, it is so reactive that it does not exist for long befo...
The electrons in an atom are arranged in shells that surround the nucleus, with each successive shell being farther from the nucleus. Electron shells consist of one or more subshells, and subshells consist of one or more atomic orbitals.
- 10 min
- Sal Khan
- What is the difference between Shells, Subshells and Orbitals?It was very hard for me to visualize t...An orbital is a space where a specific pair of electrons can be found. We classified the different Orbital into shells and sub shells to distinguis...
- At 1:41 Sal says that you could find the electron anywhere. Does that mean that it could be 200 km a...It's a strange reality where it's possible for a part of me to be 200 km away from me, even if the probabilities are as low as they are.
- helium's electronic configuration is 1S^2 but then why it is in P block ????It's not really in the 'p' block. It's there because it has properties similar to the 'p' block elements. The periodic table is organized according...
- How are *orbitals arranged in an atom*? How can one *imagine the structure* of a *real atom* not one...Alright, well let's start with the electrons first. Electrons move around in "quantized" energy states. Meaning they exist in a specific energy sta...
- Why can`t we determine the exact position of the electron?because it is microscopic and when it comes to microscopic particles the Newtonian Physics or classical physics fails we can't apply it on microsco...
- If Helium can't combine with other elements, In the composition of sun how does it combine with Hydr...Usually in chemistry we're concerned with chemical reactions. Reactions where the valence electrons of atoms interact to form new chemicals by brea...
- I keep re-watching these videos and looking online but, I do not understand anything when he is expl...The first number tells you the energy level of that orbital, or shell if you want to call it that. 1 is first shell, 2 is second shell etc. The let...
- If the s sub-shell has only one orbital then what does 1s^2 2s^1 mean?What I understood is that the notation basically tells you this: -the first number is the number of shell; -the letter is the type of orbital; -the...
- Why is it said that there are 2 electrons in the least energy 1s shell (won't they repell each other...The electrons repel each other but they are also attracted toward the nucleus by the positively charged protons. The reason 2 is the magic number f...
- If the orbitals are perfect spheres, shouldn't the energy of the orbitals reduce as we move further ...Orbitals are not orbits! Have a look at the chart Sal shows around 8:25 — do you really think that orbitals are perfect spheres? Since orbitals are...
Electron Shell. What are Shells? According to Bohr’s Atomic model electrons revolve around the nucleus in a specific circular path known as orbit or called a shell. Shells have stationary energy levels, the energy of each shell is constant. Each stationary orbit or shell is associated with a definite amount of energy.
In very simple terms an electron shell is the outside part of an atom that surrounds the atomic nucleus. The shells are orbital paths that are followed by electrons around the nucleus. Like everything in chemistry, electrons like to follow the path of least resistance.
Electron configurations describe where electrons are located around the nucleus of an atom. For example, the electron configuration of lithium, 1s²2s¹, tells us that lithium has two electrons in the 1s subshell and one electron in the 2s subshell. Created by Sal Khan. Questions.
- 5 min
- Sal Khan
