3.4: Atomic Mass and Atomic Number - Chemistry LibreTexts
https://chem.libretexts.org/Courses/Furman_University/CHM101:_Chemistry_and_Global_Awareness_(Gordon)/03:_Atoms_and_the_Periodic_Table/3.04:_Atomic_Mass_and_Atomic_Number
WEBJun 26, 2023 · The periodic table (see figure below) displays all of the known elements and is arranged in order of increasing atomic number. In this table, an element's atomic number is indicated above the elemental symbol. Hydrogen, at the upper left of the table, has an atomic number of 1. Every hydrogen atom has one proton in its nucleus.
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