Question

In: Chemistry

Which of these correctly is identified in terms of increasing 1st ionization energy? A. C <...

Which of these correctly is identified in terms of increasing 1st ionization energy?

A. C < N < O

B. Ne < P < Mg

C. F < Cl < Br

D. Cs < Na < I

E. Ca < Ba < At

Solutions

Expert Solution

When we Move from left to right across a period the first ionization energy generally increases. This is because the atomic radius generally decreases moving across a period.

When we move down a group first ionization energy decreases.This is because the atomic radius generally increases moving down a group

Consider

A. C < N < O

In general across a period ionisation energy increases but here nitrogen having a stable half filled orbital state is more stable than oxygen Hence ionisation energy of nitrogen is greater than oxygen

So, 'A' is wrong

B. Ne < P < Mg

Neon being a noble gas it has completely filled orbital state, so it is more stable than P and Mg and it's ionisation energy is greater

So 'B' is wrong

C. F < Cl < Br

Down a group ionisation energy decreases so we should have F > Cl > Br

So 'C' is wrong

D. Cs < Na < I

Down a group ionisation energy decreases so Na > Cs now consider Na and I here iodine has a smaller size compared to that of Sodium so ionisation energy of iodine is greater than sodium hence the order is I > Na > Cs ==>

Cs < Na < I

So, 'D' is correct

E. Ca < Ba < At

Down a group ionisation energy decreases so Ca > Ba but given Ca < Ba so it's wrong

Hence D is correct


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