Question

20. An atom of which of the following elements has the smallest ionization energy? A. CI C. Si B. P DS 21. An atom of which of the following elements has the largest second ionization energy? A. Cs С Ро B. Pb D. Ba Q89. 22. Which of the following forms the most stable anion in the gas phase? A. CI (electron affinity -349 kJ/mol) B. S (electron affinity = -200 kJ/mol) CO (electron affinity = -141 kJ/mol) D. C(electron affinity -122 kj/mol) 990. 091. Q92. 293. 23. According to the building-up principle or Aufbau principle, which subshell is typically filled next after the 5f subshell? A. 6d B. 4p C. 7s D. 5s 24. What is the valence-shell electron configuration for the fourth-period element in Group VA? A. 4s25p C4s24p3 B. 5s25pS D. 4s 3d 25. The ground-state valence-shell configuration of a particular atom is 4s24p. This valence shell electron configuration identifies the atom as A. p-block main-group element C. S-block main-group element B. transition element D. inner transition element 26. All of the following ground-state electron configurations are correct except A. Fe: [Ar]4s4d B. Ca: [Ar]4s C. In: [Kr]4d105s25p? D. Cu: [Ar]3d104s? 27. The ground-state electron configuration of a Mnion is 1s 2s 2p 3s 3p 3d. Therefore, Mn2+ is A. paramagnetic with five unpaired electrons B. diamagnetic C. paramagnetic with three unpaired electrons D. paramagnetic with two unpaired electrons 28. An atom of which of the following elements has the smallest atomic radius? A. Ge C. Ca B. Rb D. P

Answer 1

de we move from left to right in the periodic table the Youisation energy increases. As so is the element present to the left compared to others, it has smallest ionisation energy! 8o Answer :- (c) 6. I second rousation energy is the energy required to remove the second é. The correet answer is :- (C) po Based on the electron affinely, the most _sto kee ausen 6 3 – а. So correct answer is :- (A) u Auffan's prinogle state into subshells from lavd. given as :- that cower bleefrous to higher are filled energy X st - & 30 30 AS & Ad AL to g o oh gf bet 6 lle A after the 5f subshell the è enters into od subshell & the correct answer Ø 8 (A) 6d b Teacher's Signature

The calence shell electron configuration for the fourth period element in Group VA ¢ 8243 8. The correct answer is & (C) 452 48² 25) Electronic configuration of 45² 403 is the valence shell of As, which found in the p- block. o, Co9144 Qли е ? (А) | book ило, акоuр tlement (26) The ground shate electroue configuration of fe is [Ar]3d645² 8o correct option is ! A fe: Ar J 45²4d6 27) A all é en 3ds orbihal are unpaired , shows paramagnetism. to the correct option is - (A) paramagnetic with five uppaired eleefrons 28) A down the group size increases and the along lying down compared to the other alons given in Rb. so the correct option is % (B) Rb.