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Element तत्त्व

Element
An element is a material that consists of a single type of atom, while a compound consists of two or more types ofatoms.The nucleus is the very dense region consisting of protons and neutrons at the center of an atom. It was discoveredin 1911 as a result of Ernest Rutherford's interpretation of the 1909 Geiger–Marsden gold foil experiment. Theproton–neutron model of the nucleus was proposed by Dmitry Ivanenko in 1932. Almost all of the mass of anatom is located in the nucleus, with a very small contribution from the electron cloud.

तत्त्व
 एक तत्व एक ऐसी सामग्री है जिसमें एक ही प्रकार का परमाणु होता है, जबकि एक यौगिक में दो या दो से अधिक प्रकार के परमाणु होते हैं। नाभिक एक परमाणु के केंद्र में प्रोटॉन और न्यूट्रॉन से मिलकर बहुत घना क्षेत्र है।  1909 की अर्नेस्ट रदरफोर्ड की व्याख्या के परिणामस्वरूप इसे 1911 में खोजा गया था।  द न्यूट्रीस के न्यूट्रॉन-न्यूट्रॉन मॉडल को दिमित्री इवानेंको द्वारा 1932 में प्रस्तावित किया गया था। एनाटोम के लगभग सभी द्रव्यमान नाभिक में स्थित होते हैं, जिसमें इलेक्ट्रॉन क्लाउड से बहुत कम योगदान होता है।
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