atomic number 38
A scientist points to the atomic number 38 on a large, clear periodic table poster.
Noun: A chemical element with the symbol Sr and the atomic number 38. It is a soft, silvery-white metallic element belonging to the alkaline earth metal group. It is highly reactive, turning yellow when exposed to air due to oxidation. It is found naturally in the minerals celestite and strontianite.
The term "atomic number 38" is the definitive scientific identifier for the element strontium. It is used primarily in technical, chemical, and educational contexts to specify the element unambiguously by its proton number. * The periodic table organizes elements by their atomic number 38 comes between rubidium (37) and yttrium (39). * An isotope of atomic number 38, strontium-90, is a radioactive fission product.
- In chemistry class, we learned that the element with atomic number 38 is strontium.
- The researcher identified the sample as containing atoms of atomic number 38.
- Atomic number 38 defines the element's position and properties in the periodic table.
- In Nuclear Chemistry: The term is crucial for discussing isotopes. For example, "Strontium-90, an isotope of atomic number 38, is a significant component of nuclear fallout."
- In Materials Science: Used to specify elemental composition, e.g., "The phosphor was doped with ions of atomic number 38."
- Strontium (Sr): The common name for the element identified by atomic number 38.
- Alkaline earth metal: The group in the periodic table to which atomic number 38 belongs.
- Celestite (SrSO₄): A principal mineral ore containing strontium.
- Strontianite (SrCO₃): Another primary mineral source of strontium.
- Strontium (the elemental name).
- Element Sr.
- (Technical) The thirty-eighth element.
The term "atomic number 38" has a single, precise scientific meaning: it refers exclusively to the chemical element strontium. The "atomic number" itself is the count of protons in an atom's nucleus, defining the element's identity.
A scientist points to the atomic number 38 on a large, clear periodic table poster.
- a soft silver-white or yellowish metallic element of the alkali metal group; turns yellow in air; occurs in celestite and strontianite