Chemistry
Atoms of different elements have

Different atomic number and different number of valence electrons
Same atomic number and same electronic configuration
Different atomic number and same eletronic configu-ration
Same number of electrons and neutrons

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Chemistry
All isotopes of the same element have ________

Different atomic numbers and different atomic mass
Different atomic numbers and the same atomic mass
The same atomic number and the atomic mass
The same atomic number but different atomic masses

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