Describe briefly the structure of atomic nucleus give an example
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The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom, discovered in 1911 by Ernest Rutherford based on the 1909 Geiger–Marsden gold foil experiment
The hydrogen nucleus is the smallestnucleus because it consists of a lone proton. It is 1.75 femtometers (1.75 x 10-15 m). The uranium atom, in contrast, contains many protons and neutrons. Its nucleus is about 15 femtometers
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Nucleus Definition in Chemistry
Learn About the Atomic Nucleus
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An atomic nucleus consists of protons and neutrons held together by the strong nuclear force. ALFRED PASIEKA/SCIENCE PHOTO LIBRARY / Getty Images
byAnne Marie Helmenstine, Ph.D.
Updated March 06, 2017
Nucleus Definition
In chemistry, a nucleus is the positively charged center of the atom consisting of protons and neutrons. It's also known as the "atomic nucleus". The word "nucleus" comes from the Latin word nucleus, which is a form of the word nux, which means nut or kernel. The term was coined in 1844 by Michael Faraday to describe the center of an atom. The sciences involved in the study of the nucleus, its composition, and characteristics are called nuclear physics and nuclear chemistry.
Protons and neutrons are held together by the strong nuclear force. Electrons, although attracted to the nucleus, move so fast they fall around it or orbit it at a distance. The positive electrical charge of the nucleus comes from the protons, while the neutrons have no net electrical charge. Nearly all the mass of an atom is contained within the nucleus, since protons and neutrons have much more mass than electrons. The number of protons in an atomic nucleus defines its identity as an atom of a specific element.
The number of neutrons determines which isotope of an element the atom is.
Size of the Atomic Nucleus
The nucleus of an atom is much smaller than the overall diameter of the atom because the electrons can be distant from the atom's center. A hydrogen atom is 145,000 times larger than its nucleus, while a uranium atom is around 23,000 times larger than its nucleus. The hydrogen nucleus is the smallest nucleus because it consists of a lone proton. It is 1.75 femtometers (1.75 x 10-15 m). The uranium atom, in contrast, contains many protons and neutrons. Its nucleus is about 15 femtometers.
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The hydrogen nucleus is the smallestnucleus because it consists of a lone proton. It is 1.75 femtometers (1.75 x 10-15 m). The uranium atom, in contrast, contains many protons and neutrons. Its nucleus is about 15 femtometers
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Science, Tech, Math › Science
Nucleus Definition in Chemistry
Learn About the Atomic Nucleus
ShareFlipboardEmail

An atomic nucleus consists of protons and neutrons held together by the strong nuclear force. ALFRED PASIEKA/SCIENCE PHOTO LIBRARY / Getty Images
byAnne Marie Helmenstine, Ph.D.
Updated March 06, 2017
Nucleus Definition
In chemistry, a nucleus is the positively charged center of the atom consisting of protons and neutrons. It's also known as the "atomic nucleus". The word "nucleus" comes from the Latin word nucleus, which is a form of the word nux, which means nut or kernel. The term was coined in 1844 by Michael Faraday to describe the center of an atom. The sciences involved in the study of the nucleus, its composition, and characteristics are called nuclear physics and nuclear chemistry.
Protons and neutrons are held together by the strong nuclear force. Electrons, although attracted to the nucleus, move so fast they fall around it or orbit it at a distance. The positive electrical charge of the nucleus comes from the protons, while the neutrons have no net electrical charge. Nearly all the mass of an atom is contained within the nucleus, since protons and neutrons have much more mass than electrons. The number of protons in an atomic nucleus defines its identity as an atom of a specific element.
The number of neutrons determines which isotope of an element the atom is.
Size of the Atomic Nucleus
The nucleus of an atom is much smaller than the overall diameter of the atom because the electrons can be distant from the atom's center. A hydrogen atom is 145,000 times larger than its nucleus, while a uranium atom is around 23,000 times larger than its nucleus. The hydrogen nucleus is the smallest nucleus because it consists of a lone proton. It is 1.75 femtometers (1.75 x 10-15 m). The uranium atom, in contrast, contains many protons and neutrons. Its nucleus is about 15 femtometers.
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