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Calcium
The relative atomic mass of Calcium is 40.078 amu.
The relative atomic mass of an element in the periodic table is the average atomic mass of a given element's stable isotopes.

en.wikipedia.org/wiki/Isotopes_of_calcium

Calcium (20Ca) has 24 isotopes, from 34Ca to 57Ca. There are five stable isotopes plus one .... The precision of the isotope abundances and atomic mass is limited through variations. The given ranges should be applicable to any normal ...

www.chemicalelements.com/elements/ca.html

Name: Calcium Symbol: Ca Atomic Number: 20. Atomic Mass: 40.078 amu. Melting Point: 839.0 °C (1112.15 K, 1542.2 °F) Boiling Point: 1484.0 °C (1757.15 K, ...

www.hobart.k12.in.us/ksms/PeriodicTable/calcium.htm

Calcium. Name, Calcium. Symbol, Ca. Atomic Number, 20. Atomic Mass, 40.078 atomic mass units. Number of Protons, 20. Number of Neutrons, 20. Number of ...

www.csudh.edu/oliver/chemdata/atmass.htm

At. Mass, M.P., oC, B.P., oC. Actinium, Ac, 89, 227.028, 1050, 3200±300 ... Cd, 48 , 112.411(8), 28.40±0.01, 669.3. Calcium, Ca, 20, 40.078(9), 839±2, 1484.

socratic.org/questions/how-do-you-calculate-the-relative-atomic-mass-of-calcium

Jun 21, 2016 ... Multiply the percent abundance by the isotope and add I don't know what the abundancies or isotopes of calcium are. But I'll give an example ...

www.ciaaw.org/calcium.htm

In 1983, the Commission with its liberalized policy on uncertainties, was able to recommend as standard atomic weight Ar(Ca) = 40.078(4) weighted toward the ...

www.convertunits.com/molarmass/Calcium

Calculate the molar mass of Calcium in grams per mole or search for a chemical formula or substance.

www.webqc.org/molecular-weight-of-Ca.html

... and elemental composition: Molar mass of Ca is 40.0780 g/mol ... Symbol, Element, Atomic weight, Atoms, Mass percent. Ca, Calcium, 40.078, 1, 100.0000 % ...

www.chem.qmul.ac.uk/iupac/AtWt

The full text of the IUPAC table of atomic weights. ... For the 2015 table the atomic weight of ytterbium has been revised [see ciaaw ... 20, Ca, Calcium, 40.078(4).