What is the average of the mass numbers of the isotopes of an element called?

Answer 1

This very important characteristic is called the atomic weight. It represents a weighted average of the naturally occurring isotopes of an element. When a quantity of the element is weighed, the different isotopes - and the relative percentage they comprise of the whole - are accounted for. This makes for accurate readings in laboratory measurements.

(earth science voc. word "Atomic Mass")

Answer 2

Yes... it is called the mass number. Some call it the atomic mass or atomic weight but i believe atomic mass is the total count of the neutrons, protons and electrons in an atom. But the atomic mass usually refers to the count of neutrons and protons and the electrons being the decimal usually. although i suppose if there is enough electrons they could bring the mass up more than just making it a decimal...

Answer 3

The "atomic mass". If the mass is expressed in units of grams as is usual, the mass would be called "gram atomic mass." Sometimes, especially several decades or more ago, the value defined in the question was often called the "chemical atomic mass" of an element, which was contrasted with the "physical atomic mass" of a single isotope of the element.

Answer 4

It is the Atomic mass.

Yes but it is not really an average massbecause some isotopes are more common than others.

Answer 5

The average of the mass numbers of the isotopes of an element is called the atomic weight. It takes into account the abundance of each isotope in nature when calculating the average.

Answer 6

average atomic mass

Answer 7

The Atomic mass of that element.