# What is the number of protons, neutrons, and electrons in ""_1^1H?

In the ""^1H isotope.................?
The superscript represents nuclear mass; here it is $1$, and thus there is ONE proton in the nucleus, one positively charged, massive particle. Around the nucleus, ONE electron is conceived to circulate, to orbit. And we assign a negative charge to this particle, and its mass is negligible.
The $1$ subscript in ""_1^1H is superfluous. The symbol $H$ specifies an atomic number, $Z = 1$.
Other isotopes of hydrogen exist, for instance $\text{deuterium}$, ""^2H, which has (necessarily) one nuclear proton (why necessarily, given what I have said?) and what else, and also the $\text{tritium}$ isotope, ""^3H. How many neutrons here?