atomic number 1
Definition
- Noun:
- A nonmetallic univalent element: This refers to a chemical element that is not a metal, forms one bond, and is normally a colorless, odorless, highly flammable diatomic gas. It is the simplest, lightest, and most abundant element in the universe.
Usage Examples
- Noun:
- Hydrogen is atomic number 1 on the periodic table.
- The rocket's fuel tank was filled with atomic number 1.
Advanced Usage
- Scientific Context: The term "atomic number 1" is used primarily in formal scientific, educational, or technical contexts to refer unambiguously to the element hydrogen by its defining property—the number of protons in its nucleus.
- In nuclear physics, isotopes of atomic number 1, like deuterium and tritium, are of great interest.
Variants and Related Words
- Hydrogen (H): The common name for the element with atomic number 1.
- Hydrogen fusion powers the sun.
- Protium: The most common isotope of atomic number 1, with one proton and no neutrons.
- Deuterium: A stable isotope of atomic number 1, with one proton and one neutron.
- Tritium: A radioactive isotope of atomic number 1, with one proton and two neutrons.
Synonyms
- Hydrogen: The direct and most frequently used synonym.
- H: The chemical symbol for the element.
Related Phrases
- Atomic number: The number of protons in the nucleus of an atom, which defines the element. "Atomic number 1" is a specific instance of this concept.
- The concept of atomic number is fundamental to the periodic table.
Noun
-
a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe
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