Subshell

Science / Chemistry / Subshell: A set of electrons with the same azimuthal quantum number. The number of electrons permitted in a subshell is equal to 2ell + 1.

Lanthanide

Science / Chemistry / Lanthanide: Elements 57-70 are called lanthanides. Electrons added during the Aufbau construction of lanthanide atoms go into the 4f subshell. MORE

Hunds Rule

Science / Chemistry / Hunds Rule: A rule of thumb stating that subshells fill so that the number of unpaired spins is maximized, or 'spread them out and line them up.' MORE

Pseudocore

Science / Chemistry / Pseudocore: Electrons in d or f subshells which are outside the noble gas core. MORE

Actinide

Science / Chemistry / Actinide: Elements 89-102 are called actinides. Electrons added during the Aufbau construction of actinide atoms go into the 5f subshell. Actinides are unstable and undergo radioactive decay. The most common ac MORE

Shell

Science / Chemistry / Shell: A set of electrons with the same principal quantum number. The number of electrons permitted in a shell is equal to 2n2. A shell contains n2 orbitals, and n subshells. MORE

Block

Science / Chemistry / Block: A region of the periodic table that corresponds to the type of subshell (s, p, d, or f) being filled during the Aufbau construction of electron configurations. MORE

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