Browse Lemmas

Lemmas found: 171

Add New Lemma
Clear
ytterbium

A soft, silvery metallic chemical element with the symbol Yb and atomic number 70, belonging to the lanthanide series.

Noun chemical_compound Level 1100
yttrium

A soft, silvery metallic chemical element with the symbol Y and atomic number 39, used chiefly in alloys, phosphors, lasers, and certain electronic co...

Noun chemical_compound Level 1100
zirconium

A hard, gray-white metallic chemical element with the symbol Zr and atomic number 40, valued for its resistance to corrosion and used in nuclear react...

Noun chemical_compound Level 1100
gamma ray

A highly penetrating form of electromagnetic radiation with extremely short wavelengths and very high energy, produced by nuclear decay and other nucl...

Noun chemical_compound Level 1120
aerosol propellant

An aerosol propellant is a compressed or liquefied gas that expels a product from an aerosol container when released.

Noun chemical_compound Level 1399
arsenic poison

A poisonous preparation containing arsenic, especially one used to poison someone.

Noun chemical_compound Level 1399
bicarbonate

The bicarbonate ion is the negatively charged HCO₃⁻ ion formed when carbonic acid loses a hydrogen ion.

Noun chemical_compound Level 1399
chemical bond

A chemical bond is the force that holds atoms or ions together in a molecule or compound.

Noun chemical_compound Level 1399
chemical element

A chemical substance made up of atoms that all have the same atomic number.

Noun chemical_compound Level 1399
crystal methamphetamine

A highly pure form of methamphetamine that commonly appears as clear crystalline pieces.

Noun chemical_compound Level 1399
formalin

Formalin is an aqueous solution of formaldehyde, especially one used as a preservative, disinfectant, or embalming fluid.

Noun chemical_compound Level 1399
hydroxide ion

The negatively charged OH⁻ ion, consisting of one oxygen atom bonded to one hydrogen atom.

Noun chemical_compound Level 1399
lithium

A soft, silvery-white chemical element (symbol Li), the lightest metal, used in batteries and psychiatric medication.

Noun chemical_compound Level 1399
methyl group

A univalent group of atoms, –CH₃, formed by removing one hydrogen atom from methane and found in many organic compounds.

Noun chemical_compound Level 1399
mineral nutrient

A mineral nutrient is an inorganic chemical element that an organism needs for normal growth and functioning, such as iron, calcium, or potassium.

Noun chemical_compound Level 1399
oxidation

A chemical reaction in which a substance loses electrons, often by combining with oxygen or another oxidizing agent.

Noun chemical_compound Level 1399
phosphate group

A phosphate group is a PO₄ unit attached to an organic molecule, especially in biochemistry.

Noun chemical_compound Level 1399
phosphate ion

The phosphate ion is the polyatomic anion PO₄³⁻, or, in broader usage, a compound containing that ion.

Noun chemical_compound Level 1399
polar molecule

A polar molecule is a molecule with separated positive and negative charge centers, giving it a net electric dipole moment.

Noun chemical_compound Level 1399
valence

An atom’s capacity to form chemical bonds, expressed by the number of electrons it can lose, gain, or share.

Noun chemical_compound Level 1399
valency

The number of chemical bonds an atom of an element can form, determined by its bonding electrons.

Noun chemical_compound Level 1399