In Chapter 1, we described Dalton’s theory that each chemical compound has a particular combination of atoms and that the ratios of the numbers of atoms of the elements present are usually small whole numbers. There are many ways to find the atomic mass of an element, but the easiest way is to look it up on the periodic table of elements. The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10-19 coulombs. The Molecular mass of an element can be calculated by adding the atomic masses of each of its constituents. Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z. This list contains the 118 elements of chemistry.
We have defined a mole based on the isotopic atomic mass of carbon-12. The Molecular mass of an element can be calculated by adding the atomic masses of each of its constituents. click on any elements name for further information on chemical properties, environmental data or health effects. The atomic mass of an element is the relative average of all of the naturally occurring isotopes of that element and atomic mass is the number that appears in the periodic table. (2 atoms)(30.973761 amu/atom) = 6.0474 amu Arsenic is a chemical element with atomic number 33 which means there are 33 protons in its nucleus. Periodic table Elements molar mass Chemical elements listed by atomic mass The elements of the periodic table sorted by atomic mass.