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what element has an atomic number of 99?

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Answer:

Einsteinium has 99 atomic number

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Answer:

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Explanation:

Explanation: Einsteinium (Es), synthetic chemical element of the actinoid series of the periodic table, atomic number 99. Not occurring in nature, einsteinium (as the isotope einsteinium-253) was first produced by intense neutron irradiation of uranium-238 during the detonation of nuclear weapons.

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