Chemistry
Atoms of different elements have

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

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Chemistry
All isotopes of the same element have ________

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

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