With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: In their atomic nuclei carbon all has the same number of protons.
text_B: The atomic number or proton number -LRB- symbol Z -RRB- of a chemical element is the number of protons found in the nucleus of an atom .. chemical element. chemical element. proton. proton. nucleus. atomic nucleus. atom. atom. It is identical to the charge number of the nucleus .. nucleus. atomic nucleus. charge number. charge number. The atomic number uniquely identifies a chemical element .. chemical element. chemical element. In an uncharged atom , the atomic number is also equal to the number of electrons .. atom. atom. uncharged. electric charge. The atomic number Z , should not be confused with the mass number A , which is the total number of protons and neutrons in an atom .. atom. atom. mass number. mass number. This number of neutrons , N , completes the weight  : A = Z + N -LRB- all are whole numbers -RRB- .. number of neutrons. neutron number. Since protons and neutrons have approximately the same mass -LRB- and the mass of the electrons is negligible for many purposes -RRB- and the mass defect of nucleon binding is always small compared to the nucleon mass , the atomic mass of any atom , when expressed in unified atomic mass units -LRB- making a quantity called the `` relative isotopic mass '' -RRB- , is roughly -LRB- to within 1 % -RRB- equal to the whole number A.. atom. atom. mass defect. Binding energy#Mass change. atomic mass. atomic mass. unified atomic mass units. Atomic mass unit. relative isotopic mass. atomic mass. Atoms with the same atomic number Z but different neutron numbers N , and hence different atomic masses , are known as isotopes .. neutron. neutron. A little more than three-quarters of naturally occurring elements exist as a mixture of isotopes -LRB- see monoisotopic elements -RRB- , and the average isotopic mass of an isotopic mixture for an element -LRB- called the relative atomic mass -RRB- in a defined environment on Earth , determines the element 's standard atomic weight .. atomic mass. atomic mass. atomic weight. atomic weight. Historically , it was these atomic weights of elements -LRB- in comparison to hydrogen -RRB- that were the quantities measurable by chemists in the 19th century .. The conventional symbol Z comes from the German word Zahl meaning number / numeral / figure , which , prior to the modern synthesis of ideas from chemistry and physics , merely denoted an element 's numerical place in the periodic table , whose order is approximately , but not completely , consistent with the order of the elements by atomic weights .. German. German language. periodic table. periodic table. Only after 1915 , with the suggestion and evidence that this Z number was also the nuclear charge and a physical characteristic of atoms , did the word Atomzahl -LRB- and its English equivalent atomic number -RRB- come into common use in this context .
related.