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Nascent Hydrogen. The hydrogen gas, which is just liberated as a result of a chemical is called nascent hydrogen or newly born hydrogen. It is obtained by passing dihydrogen gas at atmospheric pressure through an electric arc between two tungsten rods. The electric arc maintains a temperature around 4000 - 4500Â°C.
(1) When a star exhausts the hydrogen in its core, it becomes a giant or supergiant. The layer immediately above the core becomes hot enough to initiate the fusion of hydrogen into helium. The star now has THREE main layers: ( 1 1) Helium core (inner layer): Releases energy as it shrinks in radius. ( 2 2) Fusion shell: Releases energy as it fuses hydrogen into helium. ( 3 3) Hydrogen envelope (outer layer): Absorbs energy, and swells greatly in size.