neptuniy – u-238 ning neytron bombardimonlari natijasida yadroviy reaktorlarda ishlab chiqarilgan transuranik element: tez plutonyumga, keyin esa u-235 ga pasayadi. Ramz: np; atom raqami: 93.
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neptunium– a transuranic element produced in nuclear reactors by the neutron bombardment of u-238: decays rapidly to plutonium and then to u-235. Symbol: np; atomic number: 93.
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neytrallash– natijada olingan eritma kimyoviy jihatdan neytral (ph = 7) bo'lmaguncha kislotadan kislotali eritma yoki eritma qo'shiladi.
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Neutralization– to add an acid to a basic solution or a base to an acidic solution until the resulting solution is chemically neutral (ph = 7).
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neytron– hech qanday zaryadsiz elementar zarracha, protonga qaraganda biroz kattaroq massa va ½ ga aylanadi: vodoroddan tashqari barcha atomlarning yadrosini tashkil qiladi. Belgilar: n.
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neutron– an elementary particle having no charge, mass slightly greater than that of a proton, and spin of ½: a constituent of the nuclei of all atoms except those of hydrogen. Symbol: n.
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niatsin– nikotinga oksidlanish natijasida hosil qilingan va pellagraning oldini olish va davolashda ishlatiladigan yangi go'sht, xamirturush va hokazolarda mavjud vitamin-b kompleksining tarkibiy qismi bo'lgan c 6 h 5 no 2 kristalli kislotasi.
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niacin– acrystalline acid, c 6 h 5 no 2 , that is a component of the vitamin-b complex, found in fresh meat, yeast, etc., produced by the oxidation of nicotine, and used in the prevention and treatment of pellagra.
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nikel – temir va kobaltga o'xshash qattiq, kumush-oq, po'stlog'li va zararsiz metall element, oson oksidlanmagan: asosan qotishmalarda, galvanikda va organik sintezda katalizator sifatida ishlatiladi. Ramz: ni; atom og'irligi: 58,71; atom raqami: 28; o'ziga xos tortishish: 20 ° c da 8.9
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nickel–a hard, silvery-white, ductile and malleable metallic element, allied to iron and cobalt, not readily oxidized: used chiefly in alloys, in electroplating, and as a catalyst in organic synthesis. Symbol: ni; atomic weight: 58.71; atomic number: 28; specific gravity: 8.9 at 20°c
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niobiy – kimyoviy xossalarida tantalga o'xshash po'lat kulrang metall element; 9kdan past bo'lgan superkompyuterga aylanadi; asosan qotishma çeliklarda ishlatiladi. Ramz: nb; atom raqami: 41; atom og'irligi: 92.906, solishtirma og'irlik: 20.4 daraja 8.4.
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niobium– a steel-gray metallic element resembling tantalum in its chemical properties; becomes a superconductor below 9 k; used chiefly in alloy steels. Symbol: nb; atomic number: 41; atomic weight: 92.906;specific gravity: 8.4 at 20°c.
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nitrat– nitrat kislota tuzining yoki esterining yoki univalent bo'lmagan guruhni -ono 2 yoki no 3 ni o'z ichiga olgan har qanday aralash
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nitric oxide– a colorless, slightly water-soluble gas, no, formed by the action of dilute nitric acid on copper, and by the direct combination of atmospheric oxygen and nitrogen at the high temperatures of an electric arc: an intermediate in the manufacture of nitric acid.
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nitrid– faqat ikkita elementni o'z ichiga oladigan tarkibiy qism bo'lib, ular ko'proq elektrodgativ bo'lgan azotdir.
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nitride – a compound, containing two elements only, of which the more electronegative one is nitrogen.
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nitrogliserin – rangli, qalin, yog'li, yonuvchan, portlaydigan, engil suvda eriydigan suyuqlik, c 3 h 5 n 3 o 9, azot va sulfat kislotalari bilan glitseroldan tayyorlangan: asosan, raketalarni ishlab chiqarishda dinamit va boshqa portlovchi moddalarning tarkibiy qismi sifatida ishlatiladi va angina pektorisini davolashda vazodilatator sifatida tibbiyotda qo'llaniladi.
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nitrogen– a colorless, odorless, gaseous element that constitutes about four-fifths of the volume of the atmosphere and is present in combined form in animal and vegetable tissues, especially in proteins: used chiefly in the manufacture of ammonia, nitric acid, cyanide, explosives, fertilizer, dyes, as a cooling agent, etc. Symbol: n; atomic weight: 14.0067; atomic number: 7; density: 1.2506 g/l at 0°c and 760 mm pressure.
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