Considering that the planet is the most massive in our solar system, the core of Jupiter is extremely pressurized. This in turn makes the core extremely hot. Scientists estimate that the planet is approximately 71% hydrogen, 24% helium, and 5% other elements by mass. It is also believed that the core is made up of primarily iron, which is considered the heaviest element found in significant quantities in our solar system.
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Jones, Chris "Jupiter Facts", February 2020, Space Facts
Editorial Staff, "42 important facts about Jupiter", july 2021, The Fact File
Ferdinand Bada, "How did jupiter get its name", January 2019, World Atlas
Michael Anissimov, "What is at the core of jupiter", May 2022, All The Science