Predict which of the following statements are true or false.
(a) Metallic character increases from top to bottom in a group and non-metallic character increases from left to right in a period.
(b) The electron gain enthalpies of noble gases are positive.
(c) The first ionization enthalpy of O is lower than that of N.
(d) Among O, O- and O2- , oxygen has the largest size.
(e) Among the oxides of group 15, N2O5 is acidic while Bi2O3 is basic.
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