Atomic Invitation Suite
This suite features atomic models of different chemical elements. There are 118 elements that have been identified. The first 94 occur naturally on Earth, while the remaining 24 are synthetic elements. The two lightest elements, hydrogen and helium, were mostly formed in the Big Bang and are the most common elements in the universe. The discovery and use of the elements began with primitive human societies that found native elements like carbon, sulfur, copper, and gold. Later civilizations extracted tin, lead, and iron from their ores by smelting, using charcoal. Alchemists and chemists subsequently identified many more, with almost all of the naturally occurring elements becoming known by 1900.