Carbon
The atomic mass of an element is the relative mass of its atom as compared with the mass of a carbon-12 atom taken as 12 units.
No element in period 3 has an atomic mass of 12.
Mass of Carbon-12 = 12 amu 5times of mass of Carbon-12 atom = 5 x 12 = 60 amu So atomic mass of element X = 60 amu Rachel- www.examville.com ,tutor
The isotope 12C has the mass number 12.
Carbon has a mass number of 12.
Carbon is a non metal element. Atomic mass of it is 12.
Carbon has an average atomic mass of about 12.
Carbon is the element with mass 12. It has 6 neutrons.
The element with a mass number of 12 is carbon. Carbon has an atomic number of 6.
212
magnesium
The element with mass number 12 is carbon. The atomic number for carbon is 6.