Question

Element Na First Ionization Energy (J/mol) 4.95 x 105 4.19 x 105 K 6. The first ionization energies for Na and K are given in the table above. a. Write the complete electron configuration for Na. b. Based on principles of atomic structure, explain why the first ionization energy of K is lower than the first ionization energy of Na. c. Which ionic solid would have the greatest melting point, NaCl or KCI? Justify your answer in terms of lattice energy.

Answer 1

of 6 Atomic number soliums is: 1. a Neutral atau ct sodium nas Il electrous, Electronic contiguration of Na is: 152 § 2p63s' 2 b) I-E of Na= 4.95 x 10 J/mol 6119x Los Tlmol, I-E of k= Na - k- 1525²zp6 38' 1525 zp6 35 3po us'. Atauic size ct 'k'is more of Na. Inization energy than is the that amo cuut of energy required to remove an electron est from outermost shell of Neutral gaseocy atam. In case of 'K', I.E meaus energy required to remove us' electrons where os tor Na it is 35 electron,

As the atanic size increases attraction of valence electron towards Nucleus decrease llen that electrun can be removed easily ie I E at of Na. 'k' is less that Lattice energy is the smeasure at attraction between oppositively Force of charged Jas. At B rc = radicsot cation Lattice energy (U) a X TA = rading of - Anim procluct of charges I Pret TA)? ux acqA ctra)? Nach, kt, product at charges For is lame, wat crci = uu>Use Nau Lattice eversy of nad is more than that ot ka. ic attractional Forces between Icus is more in Nac. To separde tacus more thermal energy is needed. Therefore Nad has more melting point thankel,