Question

why have been scientists around the world racing to develop metallic hydrogen​

Answer 1

Answer:

Higher pressure than in the Earth's inner core

This is the typical structure of a metal, and what makes them such good conductors of electricity. ... Therefore, finding metallic hydrogen on Earth would be impossible.

Answer 2

Explanation:

In 1935 Eugene Wigner and Hillard Huntington at Princeton University theorized that a molecular hydrogen lattice will dissociate to an atomic hydrogen lattice at pressures of 25 GPa, allowing electrons to flow freely through it, therefore creating metallic hydrogen.