Browse Lemmas

Lemmas found: 7607

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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
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