The nucleus of the element 21e45 contains, Chemistry

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The nucleus of the element ₂₁E⁴⁵ contains:

(1) 45 protons and 21 neutrons

(2) 21 protons and 24 neutrons

(3) 21 protons and 45 neutrons

(4) 24 protons and 21 neutrons

Ans: 21 protons and 24 neutrons

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