The fundamental question of all Earth sciences is: How, exactly, was our planet formed?
Since nobody was present back there and then, there was a number of models – and some of them were quite sophisticated. The current one is based on the Solar Wind having had blown the chemical elements away from the Proto-Sun soon after it was formed.
Dr. Larin started developing the Primordially Hydridic Earth Concept (PHE) in late 1960s. Indeed, this work required fundamental and systematic approach. Eventually, he came up with a simple yet overwhelmingly fundamental suggestion that chemical elements were distributed across the Solar System by means of magnetic separation, based on their 1st ionization potentials, 1IP. Consequently, he arrived to these well-known charts (below), linking his concept to the bulk of geochemical data for the Solar System available back then. The magnetic field formed by the Proto-Sun plasma cloud served as a huge separation device:
Magnetic separation of charged particles during the formation of the protoplanetary disk. From V. N. Larin. Our Earth, 2005
Needless to say that with years, all newly acquired data have been repeatedly confirming his model viability, e.g.:
“The Earth’s core is considered the dominant reservoir of hydrogen. An enhanced flux of hydridic fluids mobilizes the mantle and sustains tectonism and metallogenesis over 100s of millions of years.” John L. Walshe et al. (2005). Mineral systems, hydridic fluids, the Earth’s core, mass extinction events and related phenomena. Chapter 1-17, 2005. https://link.springer.com/chapter/10.1007/3-540-27946-6_17
“More than 75 vol. % of the Earth’s present-day mantle is likely to be saturated with metallic iron.” A. Rohrbach et al., 2011. Experimental Evidence for a Reduced Metal-saturated Upper Mantle. JOURNAL OF PETROLOGY, VOL. 52, No. 4. pp. 717-731. https://www.researchgate.net/publication/239735316_Experimental_Evidence_for_a_Reduced_Metal-saturated_Upper_Mantle
“There may be up to 70 times more Hydrogen in Earth’s core than in the oceans”. https://www.sciencedaily.com/releases/2021/05/210514134102.htm S. Tagawa et al., 2021. Experimental evidence for hydrogen incorporation into Earth’s core. NATURE COMMUNICATIONS, 2021 https://doi.org/10.1038/s41467-021-22035-0