Browse Lemmas

Lemmas found: 171

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actinium

A radioactive metallic chemical element with the symbol Ac and atomic number 89, occurring naturally in trace amounts and used mainly as a source of a...

Noun chemical_compound Level 1100
americium

A synthetic radioactive chemical element with the symbol Am and atomic number 95, belonging to the actinide series.

Noun chemical_compound Level 1100
antimony

A brittle, silvery-white chemical element with the symbol Sb and atomic number 51, used in alloys, flame retardants, semiconductors, and other industr...

Noun chemical_compound Level 1100
argon

A colorless, odorless, chemically inert noble gas with the atomic number 18, used especially in light bulbs, welding, and protective atmospheres.

Noun chemical_compound Level 1100
arsenic

A toxic chemical element with the symbol As and atomic number 33, occurring naturally in minerals and used in some industrial processes.

Noun chemical_compound Level 1100
astatine

A rare, highly radioactive chemical element with the symbol At and atomic number 85, belonging to the halogen group.

Noun chemical_compound Level 1100
barium

A soft, silvery-white chemical element with the symbol Ba and atomic number 56.

Noun chemical_compound Level 1100
berkelium

A synthetic radioactive chemical element with the symbol Bk and atomic number 97, belonging to the actinide series.

Noun chemical_compound Level 1100
beryllium

A hard, lightweight, silver-gray chemical element with the symbol Be and atomic number 4.

Noun chemical_compound Level 1100
bismuth

A brittle, silvery-white chemical element with the symbol Bi and atomic number 83.

Noun chemical_compound Level 1100
bohrium

A synthetic, highly radioactive chemical element with the symbol Bh and atomic number 107.

Noun chemical_compound Level 1100
boron

A chemical element with the symbol B and atomic number 5, occurring as a hard, brittle metalloid and used in materials, glass, detergents, and some ag...

Noun chemical_compound Level 1100
bromine

A toxic, reddish-brown, volatile chemical element with atomic number 35 and symbol Br; at room temperature it is a liquid and belongs to the halogen g...

Noun chemical_compound Level 1100
cadmium

A soft, silvery-white chemical element with the symbol Cd and atomic number 48, used especially in batteries, pigments, coatings, and alloys.

Noun chemical_compound Level 1100
calcium

A soft, silvery-white chemical element with the symbol Ca and atomic number 20, important in the formation of bones and teeth and present in many mine...

Noun chemical_compound Level 1100
californium

A highly radioactive chemical element with the symbol Cf and atomic number 98, produced synthetically and used mainly as a neutron source.

Noun chemical_compound Level 1100
cerium

A soft, silvery metallic chemical element with the atomic number 58, belonging to the lanthanide series.

Noun chemical_compound Level 1100
cesium

A soft, silvery-gold chemical element with the atomic number 55 and the symbol Cs; it is an extremely reactive alkali metal.

Noun chemical_compound Level 1100
chromium

A hard, shiny, steel-gray chemical element with the symbol Cr and atomic number 24, used in alloys, stainless steel, and protective or decorative coat...

Noun chemical_compound Level 1100
cobalt

A hard, silvery-blue chemical element with the symbol Co and atomic number 27, used in alloys, batteries, pigments, and other industrial applications.

Noun chemical_compound Level 1100
copernicium

A synthetic, highly radioactive chemical element with the atomic number 112 and symbol Cn.

Noun chemical_compound Level 1100
curium

A radioactive chemical element with the symbol Cm and atomic number 96, a synthetic actinide metal named after Marie and Pierre Curie.

Noun chemical_compound Level 1100
darmstadtium

A synthetic, highly radioactive chemical element with the symbol Ds and atomic number 110.

Noun chemical_compound Level 1100
dubnium

A synthetic, radioactive chemical element with the symbol Db and atomic number 105.

Noun chemical_compound Level 1100
dysprosium

A chemical element with the symbol Dy and atomic number 66, a soft, silvery rare-earth metal used in specialized magnets, lasers, and other technologi...

Noun chemical_compound Level 1100
einsteinium

A highly radioactive synthetic chemical element with the atomic number 99, classified as an actinide and represented by the symbol Es.

Noun chemical_compound Level 1100
erbium

A soft, silvery-white chemical element with the atomic number 68, used in lasers, optical fibers, and specialized alloys.

Noun chemical_compound Level 1100
europium

A soft, silvery-white chemical element with the symbol Eu and atomic number 63, one of the rare-earth metals.

Noun chemical_compound Level 1100
fermium

A synthetic radioactive chemical element with the symbol Fm and atomic number 100, produced in nuclear reactions and named after physicist Enrico Ferm...

Noun chemical_compound Level 1100
flerovium

A synthetic, highly radioactive chemical element with the atomic number 114 and symbol Fl.

Noun chemical_compound Level 1100
fluorine

A highly reactive, pale-yellow chemical element with the atomic number 9; a halogen that exists as a poisonous diatomic gas under ordinary conditions.

Noun chemical_compound Level 1100
francium

A highly radioactive chemical element with the symbol Fr and atomic number 87, belonging to the alkali metals.

Noun chemical_compound Level 1100
gadolinium

A soft, silvery-white chemical element with the atomic number 64, belonging to the lanthanide series; its symbol is Gd.

Noun chemical_compound Level 1100
gallium

A soft, silvery chemical element with the symbol Ga and atomic number 31, which melts slightly above room temperature.

Noun chemical_compound Level 1100
germanium

A rare, hard, brittle, gray-white chemical element with the symbol Ge and atomic number 32, used chiefly as a semiconductor and in infrared optics.

Noun chemical_compound Level 1100
hafnium

A chemical element with the symbol Hf and atomic number 72, a silvery-gray metal used chiefly in nuclear reactors and high-temperature alloys.

Noun chemical_compound Level 1100
hassium

A synthetic, highly radioactive chemical element with the atomic number 108 and the symbol Hs.

Noun chemical_compound Level 1100
helium

A very light, colorless, odorless, chemically inert noble gas with the atomic number 2, used in balloons, cooling systems, and scientific applications...

Noun chemical_compound Level 1100
holmium

A chemical element with the symbol Ho and atomic number 67; a soft, silvery-white rare-earth metal.

Noun chemical_compound Level 1100
indium

A soft, silvery-white chemical element with the symbol In and atomic number 49, used chiefly in semiconductors, alloys, and transparent conductive coa...

Noun chemical_compound Level 1100
iodine

A chemical element with the symbol I and atomic number 53, a lustrous dark blue-black solid that readily forms a violet vapor and is essential in smal...

Noun chemical_compound Level 1100
iridium

A hard, brittle, silvery-white chemical element with the symbol Ir and atomic number 77, belonging to the platinum group of metals.

Noun chemical_compound Level 1100
krypton

A colorless, odorless, chemically inert noble gas with the atomic number 36, found in trace amounts in the atmosphere and used in lighting and some sp...

Noun chemical_compound Level 1100
lanthanum

A soft, silvery-white chemical element with the atomic number 57; a reactive rare-earth metal.

Noun chemical_compound Level 1100
lawrencium

A radioactive, synthetic chemical element with the symbol Lr and atomic number 103, belonging to the actinide series.

Noun chemical_compound Level 1100
livermorium

A highly radioactive synthetic chemical element with the symbol Lv and atomic number 116.

Noun chemical_compound Level 1100
lutetium

A chemical element with the atomic number 71, a silvery-white metal in the lanthanide series.

Noun chemical_compound Level 1100
magnesium

A light, silvery-white metallic chemical element with the symbol Mg and atomic number 12, used in alloys, flares, fireworks, and biological processes.

Noun chemical_compound Level 1100
manganese

A hard, brittle, silvery-gray chemical element with atomic number 25, used mainly in steelmaking, batteries, and other industrial applications.

Noun chemical_compound Level 1100
meitnerium

A synthetic radioactive chemical element with the atomic number 109 and the symbol Mt; a highly unstable transactinide metal produced only in laborato...

Noun chemical_compound Level 1100