Atomic mass (ma or m) is the mass of a single atom. The atomic mass mostly comes from the combined mass of the protons and neutrons in the nucleus, with minor contributions from the electrons and …

Learn how to calculate average atomic mass using isotope abundance and amu with clear examples (boron, chlorine). Includes links to interactive tools.

Jan 8, 2025 · Masses of other atoms are expressed with respect to the atomic mass unit. For example, the mass of an atom of 1 H is 1.008 u, the mass of an atom of 16 O is 15.995 u, and the mass of an …

Jan 1, 2026 · The atomic mass of an element is the weighted average of the atomic masses of the naturally occurring isotopes of that element. The sample problem below demonstrates how to …

Atomic mass is the weighted average mass of an element 's isotopes, reflecting the masses of protons, neutrons, and electrons. It's typically found on the periodic table below the element's symbol, like …

Dec 12, 2025 · Atomic mass, the quantity of matter contained in an atom of an element. It is expressed as a multiple of one-twelfth the mass of the carbon-12 atom, which is assigned an atomic mass of 12 …

Jan 6, 2026 · The numerical value of an element’s average atomic mass in amu is exactly equal to its molar mass in grams per mole (g/mol). This provides a straightforward conversion factor. For …

Masses of other atoms are expressed with respect to the atomic mass unit. For example, the mass of an atom of 1 H is 1.008 u, the mass of an atom of 16 O is 15.995 u, and the mass of an atom of 32 S is …

Nov 18, 2025 · Atomic mass of an element = Mass of one atom of the element / 1/16th part of the mass of one atom of oxygen. After taking oxygen as a standard, the atomic mass of hydrogen comes as …

Atoms—and the protons, neutrons, and electrons that compose them—are extremely small. For example, a carbon atom weighs less than 2 × 10 −23 g, and an electron has a charge of less than 2 …