Not whole.
A small amount of matter will escape, both iron nuclei (from the crust) and free neutrons.
The R-process of stellar nucleosynthesis will then take place.
As I understand it, a normal output between three and 13 earth masses of gold is typical.
This total mass is insignificant compared to the final mass of the combined object, but it is also the engine that creates many elements higher than iron on the periodic table.
> "What this means is that a neutron star-black hole collision, while it might not erupt with material like a neutron star–neutron star collision, could power strong signals that telescopes can detect," Most says.
"For these conditions, the detailed properties of the outflow determine whether a full r-process can or cannot occur, implying that a wide range of observable phenomena is possible. We show that on average the disk outflow lanthanide fraction is suppressed relative to the solar isotopic pattern. In combination with the dynamical ejecta, these outflows imply a kilonova with both blue and red components."
I've been working on a Deep Convolutional Generative Adverserial Network (DCGAN) which utilizes astronomical data and have been on an astronomy kick.
Cutting funding to pure science research is a profound mistake, pure science research puts our nation at the forefront of technological discovery and is of national strategic importance.