atomic mass number


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Atomic Mass Unit Scale
The scale in which the relative atomic masses of different atoms are expressed is called atomic mass unit scale. Atomic masses are not expressed as whole numbers because natural elements are mixtures of two or more i..
Relative Atomic Mass
Relative atomic mass . Relative atomic mass of an element is the number that represents, the number of times one atom of the element is heavier than 1/12 t h of the mass of one atom of carbon Thus relative atomic mass of an elemen..
Reason for fractional atomic masses of elements
Atomic masses of many elements are in fractions not in whole numbers..
Mass number
symbolic representation of an atom The sum of the number of protons and neutrons in the nucleus of an atom is called the mass number. It is represented by the letter A. Mass number (A)= Number of protons (p) + number of neutrons (n) From the knowledge o..
Mass
In 1967, the atomic clock was adopted, choosing caesium-133 atom, which emits electromagnetic radiation of a precise and unvarying frequency, corresponding to the transition between two hyperfine levels of the ground stat..
Mass
Mass - The SI unit is kilogram. 1 kg is defined as the mass of a platinum-iridium cylinder kept at the International Bureau of W and M at Sevres, France, established in 1887. The atomic structure of mass is yet to be develop..
Equivalent Mass and Number of Electrons
Equivalent mass is equal to the molecular or atomic mass divided by the number of electrons involved in the reaction per molecule, atom or ion. For example in the reaction, two electrons are needed to produce one molecule of hydrog..
Molecular Mass
12 is the molecular mass of carbon The molecular mass of a substance is the relative mass of its molecule as compared with the mass of a 12 C atom taken as 12-units. It indicates the number of times; one molecule of the substance is heavier than atom..
Structure of the Atom
Atomic Number, Mass Number or Nucleon Number - The nuclei of atoms are made up of protons and neutrons. These two components of the nucleus are referred to as nucleons. The electrons occupy the space outside the nucleus. Since an atom..
Atomic Mass Unit Scale
Atomic Mass Unit Scale - The scale in which the relative atomic masses of different atoms are expressed is called atomic mass unit sca..
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