Hydrogen is the chemical element that is placed separately from the other elements because it has atomic number 1.
What is hydrogen?
It is the simplest chemical element (consisting of only one proton and one electron) with atomic number 1.
It is the lightest of the elements and the most abundant in the universe and in the earth's crust, in the atmosphere, hydrogen is found as a colorless, odorless and flammable gas, in its molecular form H2.
Therefore, we can conclude that Hydrogen is the chemical element that is placed separately from the other elements because it has atomic number 1.
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