what is this number?
Also known as the proton number (symbol "Z") of a chemical element - it is the number of protons found in the nucleus of every atom of that element.
Atomic number
The atomic number or proton number (symbol "Z") of a chemical element is the number of protons found in the nucleus of every atom of that element.
what is the purest form of iron called UNANSWERABLE what is this subsance? It is a chemical element with symbol Fe and atomic number 26.
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Atomic number [SEP] Introduction
The atomic number or proton number (symbol "Z") of a chemical element is the number of protons found in the nucleus of every atom of that element. The atomic number uniquely identifies a chemical element. It is identical to the charge number of the nucleus. In an uncharged atom, the atomic number is also equal to the number of electrons. The sum of the atomic number "Z" and the number of neutrons "N" gives the mass number "A" of an atom. Since protons and neutrons have approximately the same mass (and the mass of the electrons is negligible for many purposes) 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 (making a quantity called the "relative isotopic mass"), is within 1% of the whole number "A".