What is an atomic number? Learn the meaning of atomic numbers and other key terms. See examples of elements with their atomic symbols and identify ions and isotopes.

What is Atomic Mass? See atomic mass examples, learn the atomic mass definition, how to find the atomic mass of an atom, and the importance of atomic mass.

Understand the definition of atomic mass, atomic number, and atomic weight. Discover how to find atomic mass, and learn what an atomic number represents.

What is the difference between atomic mass and atomic number? Atomic mass is the average weighted mass number of all isotopes of a given element.

In this lesson we will learn how to determine the atomic number of an element by going through three examples.

The atomic mass of this element is 207.2, which refers to the total number of protons and neutrons. From this data it can be calculated that the average number of neutrons in a lead atom is 125.

Learn how to determine the number of electrons in an atom or ion from its proton number, and see examples that walk through sample problems step-by-step for you to improve your physics …

What is an element notation? Element notation refers to the symbol of the element. Atomic number and mass number may be present on its left as a subscript and superscript.

The number of protons in an uncharged atom is equal to the number of electrons in its atom; therefore, a gold atom also has 79 electrons. From the atomic mass, the total number of protons and ...

The atomic nucleus is the site of nuclear decay in atoms that partake in fission or fusion. It is also the location of the positively charged protons. The number of protons in an atom is its ...