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Why are the periods in the periodic table periodic?

Samantha Barber

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Justin Parker on March 26, 2019

The chemical properties of the elements in the periodic table are similar to the elements in the same column (which, for example, that is why all the halogens (17 / VIIA / 7A) behave in the same way). Each period repeats itself the chemical properties from the previous period, according to the column. However, most of the time, only electrons in s and p shells affect the chemical properties, because they form the valence shell of electrons, which is why periods behave the way they do even with the addition of transition metals (introduction of the orbital d) and the lathanide and the series of the actinides (introduction of the f orbitals).

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