Question

how many present of hydrogen​

Answer 1

Answer:

Tritium (symbol T, or 3H), with one proton and two neutrons in each nucleus, is the mass 3 isotope and constitutes about 10−15 to 10−16 percent of hydrogen.

...

Physical and chemical properties.

normal hydrogen deuterium

Atomic hydrogen

electron affinity 0.7542 electron volts 0.754 electron volts

nuclear spin 1/2 1

Answer 2

3

Explanation:

Hydrogen has three known isotopes. The mass numbers of hydrogen's isotopes are 1, 2, and 3, the most abundant being the mass 1 isotope generally called hydrogen (symbol H, or 1H) but also known as protium.