Windows Live® Search Results

Mass number - Wikipedia, the free encyclopedia
The mass number (A), also called atomic mass number or nucleon number, is the number of protons and neutrons (together known as nucleons) in an atomic nucleus.
Guideline Number 15
Patella Tendon Re-Alignment Maquet Procedure - Knee. The Official Website of the Executive Office of Labor and Workforce Development (EOLWD)
Guideline Number 8
Repair of AC or CC Ligaments Acromio-Clavicular Separation - Shoulder. The Official Website of the Executive Office of Labor and Workforce Development (EOLWD)

See all search results in
Windows Live® Search Results

Mass Number

Encyclopedia Article

Mass Number, in physics, the combined number of protons and neutrons in the nucleus of an atom (see Atom). An element may have one or more different mass numbers, indicating the different isotopes of that element (see Isotope).

More from Encarta

Offer: Live online homework help

Math, Science, History and English

Try Tutor.com for free!

Educating mom

Colleges reach out to single parents.

Find out how.

Cats Quiz

Two parts furry, one part ferocious.

Test your feline smarts!

Find

E-mail

Blog It