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H Definitions

Useful Words

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Atomic Number 7 : نائٹروجن , Atomic Number 16 : گندھک کا تیزاب , Atomic Number 14 : ایک دھاتی عنصر , Atomic Number 6 : کاربن , Atomic Number 10 : ایک بے رنگ غیر عامل گیسی عنصر , Atomic Number 20 : چونا , Atomic Number : جوہری عدد , Metalloid : دھات جیسا , Lanthanide : کوئی ایک نادر خاکی دھات , Atomic Number 80 : پارہ , Heptane : تیز ایندھن , Abundance : ایٹم کا تناسب , Atom : جوہر , 0 : صفر , Atomic Number 27 : کوبالٹ , Ag : چاندی , Atomic Number 79 : جس کو زنگ نہیں لگتا , Atomic Mass : جوہری وزن , Atomic Number 34 : ایک غیر دھاتی عنصر , Atomic Number 67 : ہلومیم کیمائی مادہ , Hydrogen Ion : کیمیا ہائیڈروجنی رواں , Atomic Number 2 : ہیلیم گیس , Atomic Number 81 : ایک کمیاب دھاتی عنصر , Atomic Number 19 : پوٹاشیم , Methane : بے رنگ کی آتش گیر گیس , Parathion : زہریلی کیڑے مار دوا , Cyclopropane : آتش گیر گیس , Acetylene : آتش گیر گیس , Hexane : ہیکسین ایندھن , Acetone : آتش گیر مائع , Arsine : آتش گیر زہریلی گیس

Useful Words Definitions

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Atomic Number 7: a common nonmetallic element that is normally a colorless odorless tasteless inert diatomic gas; constitutes 78 percent of the atmosphere by volume; a constituent of all living tissues.

Atomic Number 16: an abundant tasteless odorless multivalent nonmetallic element; best known in yellow crystals; occurs in many sulphide and sulphate minerals and even in native form (especially in volcanic regions).

Atomic Number 14: a tetravalent nonmetallic element; next to oxygen it is the most abundant element in the earth's crust; occurs in clay and feldspar and granite and quartz and sand; used as a semiconductor in transistors.

Atomic Number 6: an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds.

Atomic Number 10: a colorless odorless gaseous element that give a red glow in a vacuum tube; one of the six inert gasses; occurs in the air in small amounts.

Atomic Number 20: a white metallic element that burns with a brilliant light; the fifth most abundant element in the earth`s crust; an important component of most plants and animals.

Atomic Number: the order of an element in Mendeleyev's table of the elements; equal to the number of protons in the nucleus or electrons in the neutral state of an atom of an element.

Metalloid: of or being a nonmetallic element that has some of the properties of metal.

Lanthanide: any element of the lanthanide series (atomic numbers 57 through 71).

Atomic Number 80: a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures.

Heptane: a colorless volatile highly flammable liquid obtained from petroleum and used as an anesthetic or a solvent or in determining octane ratings.

Abundance: (physics) the ratio of the number of atoms of a specific isotope of an element to the total number of isotopes present.

Atom: (physics and chemistry) the smallest component of an element having the chemical properties of the element.

0: a mathematical element that when added to another number yields the same number.

Atomic Number 27: a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition.

Ag: a soft white precious univalent metallic element having the highest electrical and thermal conductivity of any metal; occurs in argentite and in free form; used in coins and jewelry and tableware and photography.

Atomic Number 79: a soft yellow malleable ductile (trivalent and univalent) metallic element; occurs mainly as nuggets in rocks and alluvial deposits; does not react with most chemicals but is attacked by chlorine and aqua regia.

Atomic Mass: (chemistry) the mass of an atom of a chemical element expressed in atomic mass units.

Atomic Number 34: a toxic nonmetallic element related to sulfur and tellurium; occurs in several allotropic forms; a stable grey metallike allotrope conducts electricity better in the light than in the dark and is used in photocells; occurs in sulfide ores (as pyrite).

Atomic Number 67: a trivalent metallic element of the rare earth group; occurs together with yttrium; forms highly magnetic compounds.

Hydrogen Ion: a positively charged atom of hydrogen; that is to say, a normal hydrogen atomic nucleus.

Atomic Number 2: a very light colorless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in Texas and Kansas).

Atomic Number 81: a soft grey malleable metallic element that resembles tin but discolors on exposure to air; it is highly toxic and is used in rodent and insect poisons; occurs in zinc blende and some iron ores.

Atomic Number 19: a light soft silver-white metallic element of the alkali metal group; oxidizes rapidly in air and reacts violently with water; is abundant in nature in combined forms occurring in sea water and in carnallite and kainite and sylvite.

Methane: a colorless odorless gas used as a fuel.

Parathion: a colorless and odorless toxic oil used as an insecticide.

Cyclopropane: a colorless flammable gas sometimes used as an inhalation anesthetic.

Acetylene: a colorless flammable gas used chiefly in welding and in organic synthesis.

Hexane: a colorless flammable liquid alkane derived from petroleum and used as a solvent.

Acetone: the simplest ketone; a highly inflammable liquid widely used as an organic solvent and as material for making plastics.

Arsine: a poisonous colorless flammable gas used in organic synthesis and to dope transistors and as a poison gas in warfare.