From the following data calculate the atomic weight of sulphur.
We see, therefore, that the atomic weight is twice the equivalent, or 55.9.
Why nail the "power metal" down to an isotope of gold with an atomic weight of 197?
The atomic weight of manganese has been frequently determined.
Thus from uranium with an atomic weight of 238 to radium there is a loss of three alpha particles.
These are the signs for the atomic weight of lead, and of silicium.
Its atomic weight has been determined by several careful investigators and is accepted as 226.
The other element, to which he gives the name Nebulium, will have an atomic weight of 2·1.
The numbers denote the atomic weight of the atom, which is the total number of protons and neutrons in its nucleus.
Substance, of any particular kind, absorb Heat in the degree of its atomic weight.
atomic weight n.
Abbr. at wt, AW
The average mass of an atom of an element, usually expressed relative to the atomic mass of carbon 12.
|atomic weight |
The mass of an atom expressed in atomic mass units. The atomic weight of an element having more than one principal isotope is calculated both from the atomic masses of the isotopes and from the relative abundance of each isotope in nature. For example, the atomic weight of the element chlorine is 35.453, determined by averaging the atomic masses and relative abundances of its two main naturally occurring isotopes, which have atomic masses of about 35 and 37. Also called relative atomic mass. Compare atomic mass. See also mass number.
The mass of a given atom, measured on a scale in which the hydrogen atom has the weight of one. Because most of the mass in an atom is in the nucleus, and each proton and neutron has an atomic weight near one, the atomic weight is very nearly equal to the number of protons and neutrons in the nucleus. (See atomic number.)