Chapter 7 - Periodic Properties of the Elements Flashcards
-Understand the meaning of effective nuclear charge (Zeff) and how Zeff depends upon nuclear charge and electron configuration -Use the periodic table to predict the trends in atomic radii, ionic radii, ionization energy, and electron affinity -Understand how the radius of an atom changes upon losing electrons to form a cation or gaining electrons to form an anion -Understand how the ionization energy changes as we remove successive electrons. Recognize the jump in ionization energy that occu
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Q
7.1 - Give It Some Thought (p. 257)
Arranging the elements by atomic weight leads to a slightly different order than arranging them by atomic number. Why does this happen? Can you find an example where the order of the elements would be different if the elements were arranged in order of icnreasing atomic weight?
A
Atomic weight depends on protons & neutrons, while atomic number is just protons.
Co has a lower atomic number (27) than Ni (28), but Co has a larger atomic weight (58.933 amu) than Ni (58.693 amu).
