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They are both in the same column on the periodic table and this means they have similar stability. You can use the electron configuration diagram to show how there outer most shells will have the same amount of electrons on them which is another way of describing how they have the same stability and thus the similar chemical properties.
Eduard22sly

Answer: they have the same chemical properties, because their electronic configuration ends with 6 valence electrons.

Explanation: selenium and sulphur have similar chemical properties because according to their electronic configuration, they both have the same valence electron(6). This valence electron makes them to fall under the same group. Elements in the same group tends to have similarities in their chemical properties.

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