Browse Lemmas

Lemmas found: 171

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mendelevium

A synthetic, radioactive chemical element with the symbol Md and atomic number 101, produced in tiny amounts in laboratories.

Noun chemical_compound Level 1100
mercury

A heavy, silvery metallic chemical element that is liquid at ordinary room temperature and is used in thermometers, electrical devices, and some indus...

Noun chemical_compound Level 1100
molybdenum

A hard, silvery-gray chemical element with the symbol Mo and atomic number 42, used mainly to strengthen steel and other alloys.

Noun chemical_compound Level 1100
moscovium

A synthetic chemical element with atomic number 115, symbol Mc, and an extremely unstable radioactive isotope; it is a transactinide element named aft...

Noun chemical_compound Level 1100
neodymium

A soft, silvery-white chemical element with the symbol Nd and atomic number 60, used especially in strong permanent magnets, lasers, and specialized g...

Noun chemical_compound Level 1100
neon

A colorless, odorless chemical element with the symbol Ne and atomic number 10, a noble gas used especially in lighting.

Noun chemical_compound Level 1100
neptunium

A radioactive chemical element with the symbol Np and atomic number 93, a silvery metal produced mainly in nuclear reactions.

Noun chemical_compound Level 1100
nickel

A chemical element with the symbol Ni and atomic number 28, used in alloys and plating.

Noun chemical_compound Level 1100
nihonium

A synthetic chemical element with the atomic number 113 and the symbol Nh; a highly radioactive transactinide metal.

Noun chemical_compound Level 1100
niobium

A chemical element with the symbol Nb and atomic number 41, a soft, gray, corrosion-resistant transition metal used in alloys, superconducting materia...

Noun chemical_compound Level 1100
nobelium

A synthetic radioactive chemical element with the symbol No and atomic number Nobelium 102, produced artificially and named after Alfred Nobel.

Noun chemical_compound Level 1100
oganesson

A synthetic, highly radioactive chemical element with the atomic number 118, symbol Og, and the heaviest currently named element.

Noun chemical_compound Level 1100
osmium

A hard, bluish-white chemical element, the densest naturally occurring element, with the symbol Os and atomic number 76.

Noun chemical_compound Level 1100
palladium

A rare, silvery-white chemical element with the symbol Pd and atomic number 46, used especially in catalytic converters, electronics, and jewelry.

Noun chemical_compound Level 1100
phosphorus

A highly reactive chemical element with the symbol P and atomic number 15, occurring in several forms, including white and red phosphorus.

Noun chemical_compound Level 1100
platinum

A dense, valuable, silvery-white metallic chemical element, used especially in jewelry, laboratory equipment, and industrial catalysts.

Noun chemical_compound Level 1100
plutonium

A radioactive chemical element with the atomic number 94, represented by the symbol Pu, used mainly in nuclear weapons and some nuclear reactors.

Noun chemical_compound Level 1100
polonium

A rare, highly radioactive chemical element with the symbol Po and atomic number 84.

Noun chemical_compound Level 1100
potassium

A soft, highly reactive chemical element with the symbol K and atomic number 19, an essential mineral and electrolyte in living organisms.

Noun chemical_compound Level 1100
praseodymium

A soft, silvery metallic chemical element with the atomic number 59, belonging to the lanthanide series; its symbol is Pr.

Noun chemical_compound Level 1100
promethium

A radioactive chemical element with the symbol Pm and atomic number 61, belonging to the lanthanide series; it has no stable isotopes and is used main...

Noun chemical_compound Level 1100
protactinium

A radioactive chemical element with the symbol Pa and atomic number 91, occurring naturally in uranium ores and used mainly for scientific research.

Noun chemical_compound Level 1100
radium

A highly radioactive chemical element with the symbol Ra and atomic number 88, occurring naturally in uranium ores.

Noun chemical_compound Level 1100
radon

A colorless, odorless, radioactive noble gas produced naturally by the decay of uranium and radium, capable of accumulating indoors and posing a healt...

Noun chemical_compound Level 1100
rhenium

A rare, silvery-white metallic chemical element with the atomic number 75, used especially in high-temperature alloys and catalysts.

Noun chemical_compound Level 1100
rhodium

A rare, hard, silvery-white chemical element with the symbol Rh and atomic number 45, used especially in catalytic converters and to plate jewelry.

Noun chemical_compound Level 1100
roentgenium

A highly radioactive synthetic chemical element with the atomic number 111 and the symbol Rg.

Noun chemical_compound Level 1100
rubidium

A soft, silvery-white chemical element with the symbol Rb and atomic number 37.

Noun chemical_compound Level 1100
ruthenium

A rare, hard, silvery-white chemical element with the atomic number 44, belonging to the platinum group of metals.

Noun chemical_compound Level 1100
rutherfordium

A synthetic radioactive chemical element with atomic number 104, symbol Rf, and belonging to the transactinide metals.

Noun chemical_compound Level 1100
samarium

A soft, silvery-white metallic chemical element with the symbol Sm and atomic number 62, used chiefly in magnets, lasers, and specialized industrial a...

Noun chemical_compound Level 1100
scandium

A soft, silvery-white metallic chemical element with the atomic number 21 and the symbol Sc.

Noun chemical_compound Level 1100
seaborgium

A highly radioactive synthetic chemical element with atomic number 106 and symbol Sg, produced in laboratories and named after chemist Glenn T. Seabor...

Noun chemical_compound Level 1100
selenium

A nonmetallic chemical element with the symbol Se and atomic number 34, used in electronics, glassmaking, pigments, and some industrial processes.

Noun chemical_compound Level 1100
silicon

A hard, brittle chemical element with the symbol Si and atomic number 14, widely used in glassmaking, ceramics, and electronic components.

Noun chemical_compound Level 1100
strontium

A soft, silvery-white chemical element with the symbol Sr and atomic number 38, occurring naturally in minerals and used in some pyrotechnics, ceramic...

Noun chemical_compound Level 1100
sulfur

A yellow, nonmetallic chemical element with the symbol S and atomic number 16.

Noun chemical_compound Level 1100
tantalum

A rare, hard, corrosion-resistant chemical element with the atomic number 73, used especially in electronic capacitors and specialized alloys.

Noun chemical_compound Level 1100
technetium

A chemical element with the symbol Tc and atomic number 43; a silvery-gray, radioactive metal produced artificially and used in some medical imaging p...

Noun chemical_compound Level 1100
tellurium

A rare, brittle, silvery-white chemical element with the symbol Te and atomic number 52.

Noun chemical_compound Level 1100
tennessine

A synthetic chemical element with atomic number 117, a highly radioactive halogen produced artificially; its symbol is Ts.

Noun chemical_compound Level 1100
terbium

A soft, silvery-white chemical element with the symbol Tb and atomic number 65, belonging to the lanthanide series.

Noun chemical_compound Level 1100
thallium

A soft, malleable, bluish-white chemical element with the symbol Tl and atomic number 81.

Noun chemical_compound Level 1100
thorium

A naturally occurring radioactive chemical element with the symbol Th and atomic number 90, a silvery metal used in nuclear technology and some specia...

Noun chemical_compound Level 1100
thulium

A soft, silvery metallic chemical element with the symbol Tm and atomic number 69, belonging to the lanthanide series.

Noun chemical_compound Level 1100
titanium

A strong, lightweight, corrosion-resistant chemical element with the symbol Ti and atomic number 22, used in alloys, aircraft, medical implants, and o...

Noun chemical_compound Level 1100
tungsten

A hard, dense, grayish-white chemical element with the symbol W and atomic number 74, known for its extremely high melting point and used in alloys, e...

Noun chemical_compound Level 1100
uranium

A heavy, radioactive chemical element with the symbol U and atomic number 92, occurring naturally in several isotopes and used as a source of nuclear ...

Noun chemical_compound Level 1100
vanadium

A hard, silvery-gray metallic chemical element with the symbol V and atomic number 23, used chiefly to strengthen steel and in some chemical compounds...

Noun chemical_compound Level 1100
xenon

A heavy, colorless, chemically inert noble gas with the atomic number 54, used in lighting, lasers, and some medical applications.

Noun chemical_compound Level 1100