How did Werner Heisenberg contribute to atomic theory?

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Werner Heisenberg contributed to atomic theory through formulating quantum mechanics in terms of matrices and in discovering the uncertainty principle, which states that a particle’s position and momentum cannot both be known exactly. The combined uncertainty in both measurements must be equal to or greater than h/(4π), where h is Planck’s constant.

What did Werner Heisenberg do during World War II?

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Werner Heisenberg led the Kaiser Wilhelm Institute for Physics in Berlin, where research into nuclear reactors and atomic bombs was conducted. Germany built neither. Whether Heisenberg deliberately slowed German atomic progress is debated. However, Germany likely never developed an atomic bomb because its atomic research was on a smaller scale than the U.S. Manhattan Project.