Question

The ionization energy will be maximum for the process :

• A. $Ba\to B{a}^{2+}$
• B. $Be\to B{e}^{2+}$
• C. $Cs\to C{s}^{2+}$
• D. $Li\to L{i}^{2+}$

Answer 1

The correct option is B $Be\to B{e}^{2+}$

We know that ionization energy decreases from top to bottom in a period. Hence Lithium has greater ionization energy than caesium and beryllium has greater ionization energy than barium. Also we know that along a period. the ionization energy increases from left to right. Beryllium has a fully filled s orbital hence ionization energy of beryllium is more than that of Lithium.