Multiple choice The ratio of the ionisation energy of 1st bohr's orbit of H atom and Be+3 is ? 1 / 16 . 1 / 4 . 1 / 9 . 1 / 25 . Reveal answer Fill a bubble to check yourself A Correct answer Explanation this option is correct because , E1 / E2 = Z12 / Z22 x n22 / n12 . since n values is 1 in this question . and Z1 = 1 , Z2 = 4 . E1 / E2 = 1 / 16 . hence this option is correct .