see go to site Atomic 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.
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- The atomic number or proton number of a chemical element is the number
of protons found in the nucleus of every atom of that element. The atomic
number uniquely identifies a chemical element. It is identical to the charge
number of the nucleus.
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- Isotopes are variants of a particular chemical element which differ in
neutron number, and consequently in nucleon number. All isotopes of a given
element have the same number of protons but different numbers of neutrons in
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- The mass number, also called atomic mass number or nucleon number, is
the total number of protons and neutrons in an atomic nucleus. It is
approximately equal to the atomic mass of the atom expressed in atomic mass
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- The atomic weight is the number of grams in 1 mol of an element at
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- Binding energy is the minimum energy required to disassemble a system of
particles into separate parts. This energy is equal to the mass defect minus
the amount of energy, or mass, that is released when a bound system is created,
and is what keeps the system together.
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- Radioactivity refers to the particles which are emitted from nuclei as a
result of nuclear instability. Because the nucleus experiences the intense
conflict between the two strongest forces in nature, it should not be
surprising that there are many nuclear isotopes which are unstable and emit
some kind of radiation.
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- It is a process when an unstable nucleus emits particle.
- Radioactive decay is the process by which an unstable atomic nucleus
loses energy by radiation, such as an alpha particle, beta particle with
neutrino or only a neutrino in the case of electron capture, or a gamma ray or
electron in the case of internal conversion.
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- The half-life of a radioactive substance is a characteristic constant.
It measures the time it takes for a given amount of the substance to become
reduced by half as a consequence of decay, and therefore, the emission of
- It is the time reach half of the original radioactive material.
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- Mass spectrometry is an analytical technique that measures the
mass-to-charge ratio of ions. The results are typically presented as a mass
spectrum, a plot of intensity as a function of the mass-to-charge ratio.