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Periodic Table Science Poster Laminated New 2022 Chart Teaching Elements Classroom Black Decoration Premium Educators Atomic Number Guide 15x20
Source: For elements with no stable isotopes, the mass number of the isotope with the. His number was based on an element's mass.
It has each element's number, symbol, name, and atomic mass. Learn about the element that is atomic number 2 on the periodic table, including key facts and figures. Each helium atom has 2 protons in its atomic nucleus.
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