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§ Halogens are a group of non metallic elements that are placed in Group 7 of the Periodic Table. There are 5 elements that are considered to be a part of this group, and that are widely known as halogens. § Halogens are used in our daily life as they are very useful and decrease the chances of being sick or getting disease.
The Hindu-Arabic numeral system which uses the digits: 1, 2, 3, 4. 5 .... etc
I'd say 4/5 of the time they are 92% useful
The bases are pentagons - 5 sided polygons.
A triangular prism has 5 faces: 2 bases that are triangles, and 3 rectangles.