what is nucleus and atomic number ?
Answers
Nucleus
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.
Protons and neutrons are bound together to form a nucleus by the nuclear force.
Atomic Number
The atomic number or proton number (symbol Z) of a chemical element is the number of protons found in the nucleus of an atom. It is identical to the charge number of the nucleus.
The atomic number uniquely identifies a chemical element. In an uncharged atom, the atomic number is also equal to the number of electrons.
Nucleus
Rutherford's experiment on scattering of Alpha particle led to the discovery of nucleus of an atom. Rutherford conclude that measure part of a space occupied by an atom is practically empty for vacant and the whole mass of atom is located in a very small,hard, dense and centrally located portion with in it the central portion of atom is the seat of positive charge with in atom Rutherford name the centre positive part of an atom as its nucleus.
The diameter of nucleus is approximately 10^-12 centimetre this is about same as the size of an electron and hence to preclude the possibility of existence of electron in the nucleus.
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Atomic number
The number of protons are the number of unit positive charge content in A nucleus of an atom of the element is called atomic number of that element. it is designated by letter 'z' as number of protons in the nucleus of an atom is equal to the number of extra nucleus electron in it that ohmic number of an element is also determine the number of electron present in an atom of the element.