§ 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.
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It usually isn't. Scientific notation is used for very large and very small numbers, that are not normally used in your daily life. Unless your "daily life" involves work in science or engineering.
In dentistry .
in alternators
zero is used badly
decimals are a part of our daily life because they are used to separate dollars from cents.