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socratic.org/questions/how-do-you-determine-the-atomic-mass-of-an-element

Explanation: Most naturally-occurring elements consist of mixtures of isotopes, so you can't just add the masses of the protons and neutrons in a single atom.

www.omnicalculator.com/chemistry/atom

How to calculate atomic number, atomic mass and charge or numbers of ...

www.livescience.com/20581-weigh-atom.html

Sep 12, 2017 ... Atomic mass is defined as the number of protons and neutrons in an atom, where each proton and neutron has a mass of approximately 1 amu ( ...

www.jove.com/science-education/11247/atomic-mass

For example, the mass number of a single nitrogen atom is 14 (7 protons + 7 neutrons). However, the average masses of atoms of most elements are not whole ...

www.westfield.ma.edu/PersonalPages/cmasi/gen_chem1/Atomic%20and%20molar%20mass/atomic_and_molar_mass.htm

On the periodic table the mass of carbon is reported as 12.01 amu. This is the average atomic mass of carbon. No single carbon atom has a mass of 12.01 amu , ...

www.irion-isd.org/cms/lib07/TX01001528/Centricity/Domain/22/Review%20Atoms%20KEY.docx

The atomic mass of an element is the total number of protons and neutrons in the nucleus of the atom. The mass number is used to calculate the number of ...

saylordotorg.github.io/text_the-basics-of-general-organic-and-biological-chemistry/s05-05-atomic-masses.html

What is the average mass of a tin atom in grams? The atomic mass of tin is 118.71 u. Concept Review Exercises. Define atomic mass. Why is it considered ...

www.uky.edu/~garose/atoms.htm

THE mass of an atom is concentrated in a very small central portion of the atom ... Isotopes are atoms with different atomic masses which have the same atomic ...

www.montgomerycollege.edu/_documents/academics/support/learning-centers/ackerman-learning-center-rockville/atomic-weights.pdf

mass of one C-12 atom. 12. 1 amu = 1.66054 x 10-24 g and 1 g = 6.02214 x 1023 amu. • Average Atomic Mass: the weighted average of the masses of the ...

www.angelo.edu/faculty/kboudrea/periodic/structure_mass.htm

The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit (amu, also known as daltons, D). The atomic mass  ...