PCl₅ (Phosphorus pentachloride) is a common laboratory compound, most commonly used as a chlorinating agent (chlorine adder) in organic synthesis.

It is also often presented to students as an example of breaking the octet rule (8 electron rule). The octet rule arises due to the fact that, in most cases, for an atom to achive its most stable state, it must have the s²p⁶ configuration.

While this is commonly the case for elements like Carbon or Oxygen, Phosphorus in this molecule doesn't follow the rule. As you can see, since there are 5 chlorine atoms bonded to the Phosphorus atom, it has 10 electrons around it.

In this molecule, the electronic configuration around the Phosphorus atom is a hybridization of the 3s,3p and 3d subshells, creating 5 sp³d hybridized orbitals.

This hybridization occurs by the excitation of an electron in the 3s subshell, up to the 3d subshell.

The hybridization of these orbitals allows Phosphorus to have 5 bonds. In the PCl₅ molecule, these bonds are made with 5 highly electronegetive Chlorine atoms.

They arrange themselves around the Phosphorus atom in the trigonal bipyramidal geometry according to VSEPR theory. This means that the Phosphorus atom is sorrounded on all sides by Chlorine atoms

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SHOWER OF HIGH ENERGY ⚡ PARTICLE 🤲
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Images of lightning 🌩️
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Aaron Kuehn did a fantastic job of literal word-building—every single bone in that running skeleton is spelled out using its actual anatomical name, from the Parietal bone at the top of the skull down to the Phalanges in the toes.
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Albert Einstein explaining his most famous breakthrough: Mass-Energy Equivalence, which is famously wrapped up in the equation
E = mc²
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Anatomy of Internal Viewing
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Aluminium was once the most expensive metal on Earth - costlier than gold

Not because it was rare (it's the most abundant metal in Earth's crust, ~8% of it), but because extracting it from its ore was incredibly difficult

The Hall–Héroult process, invented in 1886 by two 22-year-olds, changed that — and with it, aluminium went from a luxury metal to something you wrap your sandwich in.
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Niels Bohr was a Danish physicist who made groundbreaking contributions to the understanding of atomic structure and quantum theory. He is best known for developing the Bohr model of the atom, which explained how electrons move around the nucleus in fixed energy levels. His work played a major role in the development of modern physics and helped scientists better understand the behavior of atoms and radiation.
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This educational diagram illustrates the fundamental principles of Bohr’s Model of the Atom. It explains how electrons occupy specific orbits, the release of energy as light when an electron drops to a lower orbit, and how physical properties like orbital radius and electron speed change relative to the atom's energy levels.
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