[robocat]

The temperature is expected to remain above plasma temperatures even if a neutron star could cool for a billion years, so presumably normal chemistry couldn’t occur.

https://astronomy.stackexchange.com/questions/14387/what-hap...

The coldest neutron star detected “T < 42,000 Kelvin” : https://arxiv.org/abs/1901.07998

Disclaimer: I am not an astrophysicist.