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Posted by / 12-Jan-2020 23:20

Since the mass of electrons is negligible therefore the mass of atom is because of protons and neutrons which are collectively called as nucleons.

Out of three isotopes, C-12 and C-13 are stable isotopes of carbon.

The average atomic mass of carbon is 12.0107(8) amu.Throughout history, courtship has often included traditions such as exchanging valentines, written correspondence (which was facilitated by the creation of the postal service in the nineteenth century), and similar communication-based courting.Over recent decades, though, the concept of arranged marriage has changed or simply been mixed with other forms of dating, including Eastern and Indian ones; potential couples have the opportunity to meet and date each other before one decides on whether or not to continue the relationship.The concept of modern dating was initially seen as frustrating and mocked the moralistic values of traditional courtship.However, there are subtle contrasts that reflect Japan's cultural and religious differences, as well as its history of preferring arranged marriages.

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C-12 isotope of carbon is most abundant isotope of carbon and mainly found in all living organisms.