What is the relationship between an element's atomic mass and an element's isotopes?

Each isotope of a given element has the same atomic number but a different mass number, A, Which is the sum of the numbers of protons and neutrons.

Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.