atomic number 18

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The phrase "atomic number 18" refers specifically to the chemical element argon. Let's break this down to make it easy to understand.

Basic 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.
• 18: This means that argon has 18 protons in its nucleus.
• Argon: Argon is a colorless and odorless gas. It is one of the noble gases, which means it does not easily react with other elements.

Characteristics of Argon:

• Inert Gas: Argon is called an inert gas because it does not easily combine with other substances. This makes it very stable.
• Atmosphere: Argon makes up about 1% of the air we breathe.

Usage Instructions:

• You can use "argon" when talking about gases, chemistry, or the atmosphere.
• Example Sentence: "Argon, with atomic number 18, is used in light bulbs to prevent the filament from oxidizing."

Advanced Usage:

In scientific discussions, you might encounter argon in contexts such as: - Gas chromatography - Shielding gas in welding processes - As a filler gas in windows for insulation

Word Variants:

• There are no direct variants of "argon" itself, but you can refer to argon gas when emphasizing its state.

Different Meanings:

• In a general sense, "atomic number" refers to the specific property of any element, not just argon. For example, hydrogen has atomic number 1, and oxygen has atomic number 8.

Synonyms:

• There are no direct synonyms for "argon," but it is sometimes grouped with other noble gases like:
  • Helium
  • Neon
  • Krypton
  • Xenon
  • Radon

Idioms and Phrasal Verbs:

While there are no idioms or phrasal verbs specifically related to "argon," you might hear terms in scientific contexts, such as: - "Inert atmosphere": This refers to a space that contains inert gases like argon, which do not react with other materials.

Summary:

• Atomic Number 18 = Argon
• Colorless, odorless gas, inert, about 1% of the atmosphere.
• Used in various industrial applications.

Academic

Noun

1. a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere

Synonyms

• argon
• Ar