Chemistry
An electrochemical cell which is used as a source of direct electrical current at constant voltage under standard conditions is called a :

Uninterrupted power supply (UPS)
Generator
Power transmittor
Battery

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Chemistry
All isotopes of the same element have ________

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

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