Claim: Metallization pressure is different for ten different elements, one of which is hydrogen with a p, Mbar of 3.9.
Evidence: 329 helium boron 1.6 11 carbon nitrogen >> 5 0.96 oxygen 2084 neon 0.12 silicon 0.048 phosphorus 0.83 sulfur 2.0 chlorine 5.1 argon 0.11 germanium