# what is atomic mass number

Atomic Number and Mass Number
ATOMIC NUMBER AND MASS NUMBERS. After reading this section you will be able to do the following: Define and determine the atomic number of an atom.

Mass number - Wikipedia, the free encyclopedia
The mass number (A), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an .
http://en.wikipedia.org/wiki/Mass_number

Atomic mass - Wikipedia, the free encyclopedia
For elements with more than one common isotope the difference even to the most common atomic mass can be half a mass unit or more (e.g. chlorine).
http://en.wikipedia.org/wiki/Atomic_mass

Atomic mass unit - Wikipedia, the free encyclopedia
The unified atomic mass unit (Also known as amu, symbol: u) or dalton (symbol: Da) is a unit that is used for indicating mass on an atomic or molecular scale.
http://en.wikipedia.org/wiki/Atomic_mass_unit

How do I find the number of protons, electrons and neutrons that are ...
Unfortunately, the mass number isn't listed on the Table of Elements. Happily, to find the mass number, all you need to do is round the atomic weight to the .
http://education.jlab.org/qa/pen_number.html

What is atomic mass unit (AMU or amu)? Definition from WhatIs.com ...
Jan 25, 2011 . An atomic mass unit (symbolized AMU or amu) is defined as precisely 1/12 the mass of an atom of carbon-12. The carbon-12 (C-12) atom has .
http://whatis.techtarget.com/definition/0,,sid9_gci831527,00.html

Atomic Mass and Atomic Mass Number - Chemistry Quick Review of ...
Here's a quick review of what is meant by atomic mass and atomic mass number, as well as how actual particle mass relates to atomic number.

Chemical Elements.com - Uranium (U)
Atomic Number: 92. Atomic Mass: 238.0289 amu. Melting Point: 1132.0 °C ( 1405.15 K, 2069.6 °F) Boiling Point: 3818.0 °C (4091.15 K, 6904.4 °F) Number of .
http://www.chemicalelements.com/elements/u.html

Chemical Elements.com - Carbon (C)
Name: Carbon Symbol: C Atomic Number: 6. Atomic Mass: 12.0107 amu. Melting Point: 3500.0 °C (3773.15 K, 6332.0 °F) Boiling Point: 4827.0 °C (5100.15 K, .
http://www.chemicalelements.com/elements/c.html

What does atomic mass and atomic number represent
Answer. The atomic number is the number of protons in the nucleus of an atom. The atomic mass is the mass (weight) of all the components of the atom but is .