Definition

1. Noun:
   • A chemical element: A very poisonous metallic element that has three allotropic forms (yellow, black, and grey). Its compounds are used in herbicides, insecticides, and various alloys. It is found in minerals such as arsenopyrite, orpiment, and realgar. This element is represented by the symbol As.

Usage

• The term "atomic number 33" is the scientific identifier for the element arsenic. It is used primarily in technical, chemical, and academic contexts to specify the element by its fundamental property—the number of protons in its nucleus.
• Example: "The sample was contaminated with ."

Examples

• In a scientific report: "The presence of in the groundwater exceeded safety limits."
• In a chemistry textbook: "Elements like (arsenic) are classified as metalloids."

Advanced Usage

• In nuclear notation: The atomic number (33) is often written as a subscript before the element symbol (e.g., ₃₃As) to distinguish it from the mass number.
• In periodic table discussions: "The elements in group 15, including , have five valence electrons."

Variants and Related Words

• Arsenic (As): The common name for the element with atomic number 33.
• Arsenide: A compound containing arsenic in its anionic form (As³⁻).
• Arsenate: A salt or ester of arsenic acid.
• Arsenous: Relating to arsenic, especially in its trivalent state.

Synonyms

• Arsenic: The direct and most common synonym.
• Element 33: An alternative scientific designation.

Related Phrases and Contexts

• "Toxic as arsenic": An idiomatic comparison highlighting extreme toxicity, though it uses the common name.
• "Arsenic poisoning": The medical condition caused by exposure to arsenic (atomic number 33).

Noun

1. a very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and various alloys; found in arsenopyrite and orpiment and realgar