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Which of the hydrogen isotopes is radioactive?

Protium

Deuterium

Tritium

None

The two lightest isotopes of hydrogen are stable (protium and deuterium). The tritium is radioactive and unstable, with a half-life of 12.32 years. It is the only radioactive isotope of hydrogen which naturally occurs on Earth (although it is extremely rare).

Paweł Kołodziejczyk

3

Elliott Brown wikipedia → Tritium

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How do baby birds get oxygen inside their eggs?

They have a large oxygen supply from the start

Oxygen is created during protein reduction

Oxygen comes in through pores in the shell

They don't need oxygen at all

When is the Eiffel Tower the highest?

Does the candle burn more or less violently in zero gravity?

How are the laws concerning the flow of the current in the forks of the electric circuit called?

Ampère's circuit laws

Kirchhoff's circuit laws

Faraday's circuit laws

Ohm's circuit laws