chlorine, bromine
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You have to think that if two are similar, the other must also be similar in order for it to be similar
Fluorine.
Two equilateral triangles are always similar!
Fluorine has two solid forms, α- and β-fluorine. The latter crystallizes at −220 °C (−364 °F) and is transparent and soft, with the same disordered cubic structure of freshly crystallized solid oxygen, unlike the orthorhombic systems of other solid halogens. Nov 15 2019
It two angles of a triangle are similar to two angles of anther triangle then the two triangles are similar.