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en.wikipedia.org/wiki/Atomic_orbital

Each orbital in an atom is characterized by a unique set of values of the three quantum numbers n, ℓ, and m, which respectively correspond to the electron's energy, angular momentum, and an angular momentum vector component (the magnetic quantum number). Each such orbital can be occupied by a maximum of two ...

archives.library.illinois.edu/erec/University%20Archives/1505050/Rogers/Text5/Tx53/tx53.html

Each principal energy level above the second contains, in addition to one s orbital and three p orbitals, a set of five d orbitals, called the d sublevel. The five d orbitals can hold up to 10 electrons. Thus, the third level holds a maximum of 18 electrons: 2 in the s orbital, 6 in the three p orbitals, and 10 in the five d orbitals.

socratic.org/chemistry/the-electron-configuration-of-atoms/arrangement-of-electrons-in-orbitals-spd-and-f

If you look carefully, you will notice that a 1s orbital has very little electron density near the nucleus, but it builds up to a maximum as you get further from the nucleus and then decreases beyond the contour. It is sort of like a hollow tennis ball. A 2s orbital is similar to a 1s orbital, but it has sphere of electron density inside the ...

www.ck12.org/book/CK-12-Physical-Science-Concepts-For-Middle-School/section/2.43

As you can see by the images in the Figure below, some orbitals are shaped like spheres (S orbitals) and some are shaped like dumbbells (P orbitals). There are other types of orbitals as well. Models of S and P orbitals. Regardless of its shape , each orbital can hold a maximum of two electrons. Energy level I has just one ...

www.khanacademy.org/science/biology/chemistry--of-life/electron-shells-and-orbitals/v/orbitals

Introduction to orbitals. Relates energy shell to rows and periods in the periodic table.

www.chem4kids.com/files/atom_orbital.html

Two are in energy level one in suborbital s. The third electron is in energy level two and suborbital s. Are they both in the same suborbital s? No. The letter of the suborbital references the shapes of regions you will find electrons. Suborbital "s" is in a spherical shape. Suborbital "p" is shaped kind of like barbells or a figure ...

chem.libretexts.org/Core/Physical_and_Theoretical_Chemistry/Electronic_Structure_of_Atoms_and_Molecules/Electronic_Configurations/Electronic_Configurations_Intro

Jul 12, 2016 ... The four different types of orbitals (s,p,d, and f) have different shapes, and one orbital can hold a maximum of two electrons. The p, d, and ... Orbitals on different energy levels are similar to each other, but they occupy different areas in space. The 1s orbital ... The order of levels filled looks like this: 1s, 2s, 2p ...

www.brooklyn.cuny.edu/bc/ahp/LAD/C3a/C3a_build.html

(In biology, the word nucleus has other meanings, so we will call this region the atomic center). In this central region are the ... The second energy level consists of 4 orbitals (each with two electrons) a sphere shaped 2s orbital and three dumbbell shaped orbitals called 2p1, 2p2 and 2p3. When ever possible, electrons ...

www.middleschoolchemistry.com/lessonplans/chapter4/lesson3

Each energy level can accommodate or “hold” a different number of electrons before additional electrons begin to go into the next level. ... They can think of electrons as being in the different energy levels like concentric spheres around the nucleus. Since it is very ... There can be a maximum of two electrons in each orbital.