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By seeing how numbers/letters have been intersubstituted, the question comes out as "Name the gas used in amateur neutron producing fusrs followed by the 3\ number of neutrons it contains minus 1." I still didn't understand "fusrs" and "3\" but maybe that might help.

So it's working....

I suspect the answer to the question may be Deuterium, as that is the gas commonly used in fusors.

Try typing the answer as hydrogen2

Thanks for your help, I tried it, but it was wrong.

Then try deuterium2

The question is a little ambiguous, maybe the appearance of the digit 3 is simply a distraction.

The question seems to require the number of neutrons minus 1. Deuterium has 1 neutron.

So...try deuterium0....my best guess, or deuterium1 if that fails, or a combination of deuterium or hydrogen with various digits.

Remember to use all lower case and no spaces.