Which elements came first?

The elements that came first, following the Big Bang, were hydrogen, helium, and a small amount of lithium.

According to the reference provided, in the immediate aftermath of the Big Bang (over 14 billion years ago), the universe consisted primarily of these three elements. While nearly 100 naturally occurring elements exist today, along with hundreds of variants, hydrogen, helium, and lithium were the primordial elements.

Here's a breakdown:

• Hydrogen: The most abundant element in the universe.
• Helium: The second most abundant element.
• Lithium: Present in trace amounts compared to hydrogen and helium.