Baby names meanings search results: The name Aisling is a baby girl name. The name Aisling comes from the Irish origin. In Irish The meaning of the name Aisling is: Vision.
1 atomic mass unit is eqal to the mass of one-twelth of mass of one atom of carbon atom. one atomic mass unit is exactly equal to one-twelfth the mass of carbon isotope-12. it is taken with reference to atomic mass of one twelfth of carbon isotope 12. One amu (or dalton) is exactly one twelfth of the mass of an atom of the most common form of carbon. 1 amu = 1.0078...
The mass number is the number of protons added to the number of neutrons. Hydrogen only contains 1 proton and no neutrons, so that gives a mass number of 1. However, there are some isotopes of Hydrogen, in other words, some atoms that have more than zero neutrons. For example, Deuterium has 1 neutrons hence an atomic mass of 2 and Tritium has 2 neutrons hence an atomic mass of 3. The number you see for atomic mass in a periodic table is an average of the abundance of the isotopes, which is why it's a decimal like 1.007941.00794 and not a whole number.