Question

An element has two naturally occurring isotopes one is 10.013amu and is 19.9% abundant the other is 11.01amu and is 80.1% abundant. What is the average atomic mass, what element is it *



9.012Beryllium

12.011Carbon

6.941Lithium

10.812Boron​

Answer 1

Answer:

10.812Boron

Explanation:

it is the average atomic mass

Answer 2

The average atomic mass element is 10.811μ.

Explanation:

Atomic mass:

• The mass of an atom of a chemical element expressed in atomic mass units.
• It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.

Isotopes:

1. Each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei.
2. Hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.