hi well c-12 has not actually been given a unit. we know that the 12 means that it is exactly 12 units (unknown to us) in c-12. generally things are compared in relation to the mass of a c-12 atom. Something might be 1.5 times bigger relative to c-12 giving us X with 18 units. To answer your question, the half of the mass of c12 is 6 units. like i said unit is unknown but it is only used as a relative to compare the mass of other atoms because taking the mass of any one atom is irrelevant.
The mass of a carbon-12 atom is approximately 2 x 10^-26 kg. Half of this mass would be about 1 x 10^-26 kg.
6, and atom with no charge has the same amount of protons and neutrons. protons = atomic number. also mass number - atomic number = neutrons.
The answer is 1 and the atom would be a hydrogen atom.
atomic mass unit
1 atomic mass unit, or amu.
The mass number for carbon is 12, which represents the total number of protons and neutrons in the nucleus of a carbon atom.
The atomic mass of elemental Carbon is 12.011. There are two stable isotopes with differing mass numbers: 12 (98,9%) and 13 (1,1%) and one semi-stable C isotope nr. 14 (half-life time 5730 yr.)
H has a mass number of 1 (one proton, no neutrons), Carbon has a mass number of 12 (6 neutrons, 6 protons) and O has a mass number of 16 (8 neutrons and 8 protons).
100 atoms of C-12(12g/6.022x10^23) = 1.993x10^-21g
The carbon-12 atom is assigned a relative mass of exactly 12 atomic mass units (amu). This is used as the reference point for measuring the atomic masses of other elements on the periodic table.
12
Isotope.
Carbon is a non metal element. Mass number of it is 12.
The atomic mass of carbon-12 is defined as 12 atomic mass units (amu). This corresponds to the mass of a single carbon-12 atom relative to 1/12th of the mass of a carbon-12 nucleus.
The average atomic mass is the ratio of the average mass of one atom of an element to one twelfth of the mass of an atom of carbon-12. It is, the mass of an atom of the substance, rescaled so that carbon-12 would have a mass of 12.
A helium-4 atom is just about 1/3 the mass of a carbon-12 atom.
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.
The assigned atomic mass of carbon-12 is 12 atomic mass units. This is used as the standard for measuring atomic masses of other elements.
The mass number for carbon is 12, which represents the total number of protons and neutrons in the nucleus of a carbon atom.
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 atomic mass may be considered to be the total mass of protons, neutrons and electrons in a single atom (when the atom is motionless). Relative isotopic mass is the relative mass of a given isotope scaled with carbon-12 as exactly 12.
The atomic mass number of an atom, if the atom's mass number is approximately equal to 0.33 that of carbon-12, would be 4. If the question is about actual masses rather than mass numbers, the mass of a helium-4 atom is about 4.00260 atomic mass units, while the mass of a carbon-12 atom is, by definition, exactly 12.000..... atomic mass units.