Solved: Periodic Trends in Ionization EnergyReferring to

Chapter , Problem 1PE

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Problem        1PE

Periodic Trends in Ionization Energy

Referring to the periodic table, arrange the atoms Ne, Na, P, Ar, K in order of increasing first ionization energy.

Consider the following statements about first ionization energies:

(i)        Because the effective nuclear charge for Mg is greater than that for Be, the first ionization energy of Mg is greater than that of Be.

(ii)        The first ionization energy of 0 is less than that of N because in 0 we must pair electrons in the 2p orbitals.

(iii)        The first ionization energy of Ar is less than that of Ne because a 3p electron in Ar is farther from the nucleus than a 2p electron in Ne.

Which of the statements (i), (ii), and (iii) is or are true?

(a) Only one of the statements is true.

(b)        Statements (i) and (ii) are true.

(c)        Statements (i) and (iii) are true.

(d)        Statements (ii) and (iii) are true.

(e)        All three statements are true.