atomic number 21

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The term "atomic number 21" refers to a specific chemical element in the periodic table known as "Scandium." Here’s a breakdown to help you understand it better:

Explanation:

• Atomic number: This is a number that tells us how many protons are in the nucleus of an atom of an element. Each element has a unique atomic number.
• 21: For Scandium, the atomic number is 21, meaning it has 21 protons in its atoms.

Basic Description:

• Scandium is a metallic element that is silvery-white and is often considered a part of the rare earth metals group. It is found in nature in certain minerals, such as thortveitite, which comes from Scandinavia, hence the name "Scandium."

Usage Instructions:

• When using "atomic number 21" in a sentence, you can refer to it simply as "Scandium" to make your communication clearer.

Example Sentence:

• "Scandium, which has an atomic number of 21, is used in aerospace components due to its lightweight and strong properties."

Advanced Usage:

• In chemistry, you might encounter discussions about Scandium in relation to its properties, reactions, or its applications in various industries, such as in alloys and high-intensity lamps.

Word Variants:

• Scandium (noun): The name of the element itself.
• Scandic (adjective): Related to Scandium, though less commonly used.

Different Meanings:

• The phrase "atomic number 21" strictly refers to the element Scandium. It does not have alternative meanings outside of this scientific context.

Synonyms:

• There are no direct synonyms for "atomic number 21," but "Scandium" is the commonly used name for the element.

Idioms and Phrasal Verbs:

• In scientific contexts, you might not find idioms or phrasal verbs that specifically relate to "atomic number 21." However, in broader discussions about elements and chemistry, terms like "break down" (to explain in simpler terms) or "put together" (to assemble ideas or components) might be used.

Summary:

"Atomic number 21" specifically refers to the element Scandium, a metallic substance important in various industrial applications. Understanding this term is useful for anyone studying chemistry or interested in the properties of elements.

Academic

Noun

1. a white trivalent metallic element; sometimes classified in the rare earth group; occurs in the Scandinavian mineral thortveitite

Synonyms

• scandium
• Sc