Definition

Noun: 1. A series of inert gases: "Helium group" refers to the group of chemical elements in the periodic table that are characterized by their lack of chemical reactivity. These are the noble gases.

Usage

• The term "helium group" is a historical or alternative name for the noble gases, named after the first element in the series. It is primarily used in scientific and educational contexts when discussing the periodic table's group structure.
• It functions as a collective noun to refer to all elements in this vertical column.

Examples

• Scientific Context:
  • The helium group, also known as Group 18, contains elements with full valence electron shells.
  • Neon and argon are members of the helium group.

Advanced Usage

• The term is less common in modern chemistry, where "noble gases" or "Group 18" are preferred. Its use often implies a focus on the group's placement and properties starting with helium.

Variants and Related Words

• Noble gases (n): The modern, more common term for this group of elements.
• Inert gases (n): An older term, largely synonymous with noble gases, though slightly less precise as some can form compounds under extreme conditions.
• Group 18 (n): The formal designation in the IUPAC periodic table.
• Group 0 (n): An older designation for this group in the periodic table.

Synonyms

• Noble gases
• Inert gases (historical)
• Group 18 elements
• Rare gases (less common, can be misleading)

Related Phrases/Idioms

• N/A: As a specific scientific term, "helium group" is not typically used in idiomatic expressions.

Noun

1. the series of inert gases