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How old was Niels Bohr when he died ?

Answer: 77

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What was Niels Bohr theory?

Answer: His theory is that electrons travel around the nucleus.

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What goes around the nucleus in Niels Bohr model ?

Answer: The electrons

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What was Niels Bohr model ?

Answer: His model was that he showed electrons moving in orbits

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http://www.news18.com/news/india/niels-bohrs-127th-birthday-top-10-interesting-facts-514991.html

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Did his theory ever need to improve or was it a good theory?

Answer : It needed Improvement

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Perimeter Institute for Theoretical Physics

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Campaign for Niels Bohr for the 2013 Nobel Prize; Emma Shepard, Erin Strasser, Ellie Badgley-- Created using PowToon -- Free sign up at http://www.powtoon.com/ . Make your own animated videos and animated presentations for free.

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In his model, he showed electrons moving in fixed  orbits around the nucleus at a constant speed.

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His theory was that electrons can travel around the nucleus in a specific path. His theory was good but it did need some improvement.