Which one of the following has highest ionization energy A;O B;c-1 C;O-1 D;Cion energy A;O B;c-1 C;O-1 D;C
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Explanation:
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(1) Be has completely filled stable v configuration i.e. 2s
2
while in Be
+
because of positive charge, the removal of electron requires much higher energy. So, ionisation energy of Be
+
is greater than Be.
(3) Across the period, atomic size decreases and nuclear increases and thus valence shell electron(s) is/are tightly held by nucleus. So, ionisation energy is greater than Be.
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