Answer:
Hydrogen, Helium, and Lithium
Explanation:
Light elements:
Hydrogen: P redicted to be the most abundant element, making up about 74% of the universe's ordinary matter. This prediction aligns perfectly with observations.
Helium: Predicted to be the second most abundant, comprising about 25% of ordinary matter. Again, observations closely match this prediction.
Deuterium (heavy hydrogen): Predicted to be present in small amounts due to its rapid fusion into helium. Observations again agree with this prediction.
Lithium: Predicted to be even less abundant than deuterium, due to its complex formation process. This prediction is still being investigated, with some discrepancies noted between theory and observation.
