Atomic number, mass number, and isotopes (video) | Khan Academy
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ELEMENT RIDDLES 1. If you give up your seat on a bus to an elderly person, you would be considered a good ______ Samarium 2. Sometimes teachers can. - ppt download
Atomic Number, Mass Number, and Isotopes | SpringerLink
NCERT Exemplar Class 9 Science Solutions Chapter 4 - Structure of Atom | Access Free PDF