Chapter 7 & 8 - Atomic Structure and Periodicity_Part6

Chapter 7 & 8 - Atomic Structure and...

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GENERAL CHEMISTRY CHAPTERS 7 & 8 - ATOMIC STRUCTURE AND PERIODICITY PAGE 26 OF 28 Trend in Atomic Radii – Transition Metals Increase in size down a group Atomic radii of transition metals roughly the same size across the d block Much less difference than across main group elements The valence shell for transition metals is 3s 2 , 4s 2 , 5s 2 Not the electrons As another proton is added to the nucleus with each successive element, another electron is added as well, but the electron goes into a d or f orbital The number of outermost electrons stays constant The effective nuclear charge on the 3s 2 , 4s 2 , 5s 2 electrons is generally constant Trend in Ionic Radii Consider Na versus Na + Na: 1s 2 2s 2 2p 6 3s 1 Na + : 1s 2 2s 2 2p 6 The Na atom has an outer 3s electron Since it is an outermost electron, it is shielded from the nucleus by the core electrons It will contribute to the size of the atom Na + does not have the extra electron and is therefore
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Chapter 7 & 8 - Atomic Structure and...

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