Across a row in the periodic table, the ionization energy increases because the

Question

Across a row in the periodic table, the ionization energy increases because the n quantum number changes. Incresed because the l quantum number changes. Decreases because the effective nuclear charges decreases. Increases because the effective nuclear charge increases. changes little because the outer electrons all are in the same shell. which of the following bonds is most polar? B-H N-H P-H AI-H C-H Which of the following is the shortest bond? The number in parentheses is the bond energy. C-C (348 JH/mol) C-F (453 KJ/mol) C-H (411 KJ/mol) C-CI (339 KJ/mol) C-O (358 KJ/mol) Which of the following compounds is likely to have the least reactive hydrogen? H-Br (141 pm) H-I (161 pm) H-CI (127 pm) H-F (92 pm) H_2S (134m)

Explanation / Answer

47)

it increases, beacause of the valance shell electrons, that iseffectiv enuclear charge... Choose d

48)

which is most polar

H = 2.1

From all other... N = 3.0 which is the most electronegative... therefore most polar

49)

Shortest bond --> higher energy

the more energy it has, the more it attrackts... in this case, the C-H bonding is the smallest

50)

The least reactive hydrogen, is that which is very reactive

from previous notes, the shortest the bond, the more energy it requires, therefore we wnat short bonds

will be the one which is loosely bonded, that is, the one of HF

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