Question

4. Answer the following questions about periodic trends. a) Which element is larger, As or Mc? Explain (do not just state a trend) b) Which element has the lower first ionization energy, Ca or Br? Explain (do not just state a trend). c) Explain the relationship between atomic size (radius) and ionization energy.

Answer 1

Both As & Me 15 0 @ are the elements of group onder electronic configuri ration of As 7 4s²4p3 4 onfer electownie Configuration at configuration of me 7% 752 7p3 Thus for As, n=4f for me, n=7. ię for Me, the last electron enteres to a higher orbit (n=7, so, size of Me) As. b than Br, which easily combiguration much reluctant to give ca has "lowest fiout ionisation energy ca an alkaline earth metal losses the valence electswn more has a valence shell 45²4p5f very or loose an electron, This al compared to Br © And this with inerea reasing size or radius, the valence shell electowns feel comparatively less nuclear. attractive force by the nucleers. removing an electron from outer shell becomes easy This ionization energy So, the size IE decreases the size IE increases, more decreases with increasing with decreasing &