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2500 years ago, a man called Democritus was the first person to suggest that Atoms existed and everything was made out of it.

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In 1801, a person called Dalton made up and theory which was called the "Atomic theory" which suggested that all atoms of the same element have the same mass

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The discovery of Electrons by J J Thompson

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In 1905, Einstein published a paper, "Concerning an (experience-based thinking) Point of View Toward the Emission and Change of Light," in which he imagined light traveling not as a wave, but as some manner of "energy quanta."

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In 1905, Einstein created the theory of relativity and the famous equation of E=mc² (Energy equals mass times the speed of light squared)

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De Broglie used the equations of Einstein's explanation of relativity to show that particles can show wave-like (features/ qualities/ traits), and that waves can show particle-like (features/ qualities/ traits).

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In 1925, two scientists, working independently and using separate lines of mathematical thinking, applied de Broglie's thinking to explain how electrons whizzed around in atoms (an important thing/big event that was unexplainable using the equations of classical mechanics).

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In 1926, Erwin Scrödinger that these two approaches were equal (though Swiss physicist Wolfgang Pauli sent an unpublished result to Jordan showing that matrix mechanics was more complete).

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In 1927, Walter Heitler and Fritz London further developed wave mechanics to show how atomic orbitals could combine to form molecular orbitals, effectively showing why atoms bond to one another to form molecules

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In 1927, Paul Dirac applied a (related to tiny, weird movements of atoms) understanding of electric and magnetic fields to give rise to the study of "(related to tiny, weird movements of atoms) field explanation (of why something works or happens the way it does)" (QFT), which treated particles (such as photons and electrons) as excited states of a hidden (under) physical field.

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In 1927, Walter Heitler and Fritz London further developed wave mechanics to show how atomic orbitals could combine to form molecular orbitals, effectively showing why atoms bond to one another to form

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Also in 1927, Heisenberg made another major (thing that's given/work that's done) to (related to tiny, weird movements of atoms) physics. He reasoned that since matter acts as waves, some properties, such as an electron's position and speed, are "(completing/matching)," meaning there's a limit (related to Planck's constant) to how well the (high) quality of each property can be known.

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The Quantum Field Theory was composed. (This one was strong.)

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The particle called the Higgs Boson was detected by a machine called the Large Hadron Collider that can smash atoms at the speed of light.

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In 2013 Higgs received a Nobel Prize for discovering the Higgs Boson.