| The sum of the atomic mass of the protons and neutrons determines the atomic mass or atomic weight of the nucleus. |
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| A Dalton, also known as an atomic mass unit, is roughly the mass of a single proton or neutron. |
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| This was the start of the systematization of analytical chemistry and the beginning of rationalization of the atomic mass of the elements. |
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| In such a case, an element's atomic number and atomic mass should be about equal. |
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| Lithium, with an atomic mass of 6.94, is the lightest of all the metals and is therefore an obvious candidate for battery use. |
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| Density is a function of the atomic mass of the atoms in the crystal structure and the way they are packed together. |
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| The baryonic number, which is equivalent to the atomic mass number, has to remain constant for a reaction. |
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| That is, deuterium has twice the atomic mass of protium, and tritium has three times the atomic mass of protium. |
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| The mass standard in the atomic world is set by one atom of the element carbon, which is defined to be 12 atomic mass units. |
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| If you have looked at a periodic table you may have noticed that the atomic mass of an element is rarely an even number. |
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| Protons and neutrons have masses of approximately 1 atomic mass unit each, whereas electrons only have a mass of.0006 amu. |
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| With this, we can produce energetic dysprosium, atomic mass 162.5, heavy enough for nuclear reactions. |
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| Isotope is the term used for an atom of an element that differs in atomic mass from other atoms of the same element. |
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| Deuterium atoms have an atomic mass of 2, which is double that of normal hydrogen. |
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| Solid phosphorus has a tetratomic molecule with molecular weight 123.8952 atomic mass units. |
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| When a neutron is added, hydrogen's atomic mass rises to two, yielding deuterium, in isotope which is necessary for the manufacture of the hydrogen bomb. |
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| They are most active in unstable elements of high atomic mass. |
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| The first problem encountered by Mendeleïev is the fact that the existence of the isotopes returns classification by difficult atomic mass. |
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| The element's atomic mass is 200.59 grams per mole and its specific gravity is 13.5 times that of water. |
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| By means of the PTB's gold ion experiment, the atomic mass of gold was determined in the basic SI unit, the kilogram. |
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| Based on this information, in addition to the known relative atomic mass and elemental charge, the atomic mass unit could be established. |
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| Therefore, the atomic mass is one of the characteristics of each atomic family. |
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| The atomic mass unit is equal to 1.66·10-24 g or one-twelfth of the mass of a carbon atom. |
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| All the isotopes of an element have the same chemical properties, but their physical properties, such as atomic mass, vary. |
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| Lead is chosen as producer, because an element with a high atomic mass, A, provides a large nucleus target for producing evaporation neutrons. |
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| The sum of protons and neutrons constitutes an element's atomic mass. |
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| He postulated that all the atoms of the same element have the same atomic mass, while the atoms of a different element have a different atomic mass. |
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| Elements of high atomic mass are relatively less stable than objects of lower atomic mass, and are more likely to undergo the process of alpha decay. |
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| After the turn of the century, changes in the model of the atom led to an awareness of a relationship between the atomic mass and the number of particles in the nucleus. |
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| An electron's mass is so small that it is usually given a value in atomic mass units, compared to the value of 1 assigned to neutrons and protons. |
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| This standard was adopted internationally in 1961, replacing an arbitrarily assigned value of 16.000 amu for the atomic mass of an atom of oxygen. |
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| At the other end, an atomic mass unit equals 1.66 yoctograms. |
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| Two levels of the caesium nuclide of atomic mass number 133 have proven to be particularly suitable, the energy difference of which corresponds to a frequency in the microwave range. |
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| At the cross point of straight and adjoining hyperboles on this line, abscissa is equal to doubled atomic mass of the element. |
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| It has been determined experimentally that the binding energy per nucleon is a maximum of about 1.4 10−12 joule at an atomic mass number of approximately 60 that is, approximately the atomic mass number of iron. |
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| The determination of trace elements of average atomic mass, such as chromium, copper and nickel may be subject to strong interference from other isobaric and polyatomic ions. |
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| In future, this experiment might lead to a change in the definition of the kilogram, in that the kilogram may no longer be related to a prototype, but rather to an atomic mass and thus refer to a physical constant. |
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| Atomic mass of an element in Table of Elements is presented by the average atomic mass of all stable isotopes of the element with taking their content in the lithosphere. |
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| Thus, Avogadro was able to offer more accurate estimates of the atomic mass of oxygen and various other elements, and made a clear distinction between molecules and atoms. |
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| Each Element has 2 Atomic Numbers but has the same Atomic Mass. |
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