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What are the elements of a black hole it just says what a black hole is? There must be elements that the sun consists of, right?
If your question is "What elements are in a black hole?"
The answer is: The gravity is too great for there to be "elements" (atoms or molecules) inside or near the surface of a black hole. The extreme gravity tears apart everything and compresses it.
Some distance away (especially far away, here on Earth) the black hole doesn't alter matter, but as things get closer they fall at increasing speeds to the surface, becoming a part of the black hole. Everything becomes crushed, becoming elementary particles; what atoms are made of.
NASA's webpage: "NuSTAR Probes Black Hole Jet Mystery" explains that plasma, x-rays, and eventually light can leave a black hole at the poles. See also: "An elevation of 0.1 light-seconds for the optical jet base in an accreting Galactic black hole system" (26 Oct 2017) which says:
"Relativistic plasma jets are observed in many accreting black holes. According to theory, coiled magnetic fields close to the black hole accelerate and collimate the plasma, leading to a jet being launched. Isolating emission from this acceleration and collimation zone is key to measuring its size and understanding jet formation physics. But this is challenging because emission from the jet base cannot be easily disentangled from other accreting components.
Here, we show that rapid optical flux variations from a Galactic black-hole binary are delayed with respect to X-rays radiated from close to the black hole by ~0.1 seconds, and that this delayed signal appears together with a brightening radio jet. The origin of these sub-second optical variations has hitherto been controversial.
Not only does our work strongly support a jet origin for the optical variations, it also sets a characteristic elevation of <~$10^3$ Schwarzschild radii for the main inner optical emission zone above the black hole, constraining both internal shock and magnetohydrodynamic models.
Similarities with blazars suggest that jet structure and launching physics could potentially be unified under mass-invariant models. Two of the best-studied jetted black hole binaries show very similar optical lags, so this size scale may be a defining feature of such systems.".
So, what goes in is not what comes out.
See also this article about AGN: "The largely unconstrained multiphase nature of outflows in AGN host galaxies" (28 Feb 2018).
Black Hole-Powered Jet of Electrons and Sub-Atomic Particles Streams From Center of Galaxy M87
Relativistic jets may provide evidence for the reality of frame-dragging. Gravitomagnetic forces produced by the Lense-Thirring effect (frame dragging) within the ergosphere of rotating black holes combined with the energy extraction mechanism by Penrose have been used to explain the observed properties of relativistic jets. The gravitomagnetic model developed by Reva Kay Williams predicts the observed high energy particles (~GeV) emitted by quasars and active galactic nuclei; the extraction of X-rays, γ-rays, and relativistic e$^-$-$,e^+$ pairs; the collimated jets about the polar axis; and the asymmetrical formation of jets (relative to the orbital plane).
The Penrose process (also called Penrose mechanism) is a process theorised by Roger Penrose wherein energy can be extracted from a rotating black hole. That extraction is made possible because [some of] the rotational energy of the black hole is located not inside the event horizon of the black hole, but on the outside of it in a region of the Kerr metric spacetime called the ergosphere, a region in which a particle is necessarily propelled in locomotive concurrence with the rotating spacetime. In the process, a lump of matter enters into the ergosphere of the black hole, and once it enters the ergosphere, it is forcibly split into two parts.
Although momentum is conserved the effect is that more energy can be extracted than was originally provided, the difference being provided by the black hole itself. In summary, the process results in a slight decrease in the angular momentum of the black hole, which corresponds to a transference of energy to the matter. The momentum lost is converted to energy extracted.
The maximum amount of energy gain possible for a single particle via this process is 20.7%. The process obeys the laws of black hole mechanics. A consequence of these laws is that if the process is performed repeatedly, the black hole can eventually lose all of its angular momentum, becoming non-rotating, i.e. a Schwarzschild black hole. In this case the theoretical maximum energy that can be extracted from a black hole is 29% its original mass. Larger efficiencies are possible for charged rotating black holes.
Click to animate.
An unrelated effect is described as Hawking radiation:
Physical insight into the process may be gained by imagining that particle-antiparticle radiation is emitted from just beyond the event horizon. This radiation does not come directly from the black hole itself, but rather is a result of virtual particles being "boosted" by the black hole's gravitation into becoming real particles. As the particle-antiparticle pair was produced by the black hole's gravitational energy, the escape of one of the particles lowers the mass of the black hole.
That shouldn't be confused with the Hawking-Penrose Singularity Theorem either.