group13post - Group 13 or Group 13 or III III A or 3A A or...

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Unformatted text preview: Group 13 or Group 13 or III III A or 3A A or 3A What are their electronic structures? Examining the Main Group oble gas] ns p [noble gas] ns 2 np 1 [He]2s 2 2p 1 [Ne]3s 2 3p 1 basic structural aspects What species will they form? Examining the Main Group Group 13 or Group 13 or III III A or 3A A or 3A- it is always about gaining stability for their valence electrons ia transfer of an e nic species A +3 isoelectronic with EAREST noble gas via : transfer of an e- Ionic species filled ns 2 subshell A 1+ NEAREST noble gas Anions? Gaining e-s by transfer not attractive. Why? Only first gain of electron is ia sharing of an e- ovalent species favourable or - and unlike alkali metals this would not result in filled subshell. AX 4- AX 3 via : sharing of an e Covalent species isoelectronic with NEXT EAREST noble gas electron deficient Gaining e-s through sharing much more attractive. Why? Energy is needed to share but energy is also gained by forming localized applying the basic structural aspects NEAREST noble gas bonds..more than is gained by the formation of any ionic bonding interactions. A n when X is also A semimetal as t share metallically need virtually the same electronegativity Examining the Main Group Group 13 or Group 13 or III III A or 3A A or 3A Occurrence in Nature AX /AX- and A 3+ salts 3 4 Primarily in ionic form, AX 4 and A 3+ , in minerals B and Al common Ga, In and Tl trace amounts aining configuration of a borax, Na 2 [ B 4 O 5 (OH) 4 ] bauxite (hydrated Al oxide) beryl Gaining configuration of a noble gas obviously most preferred Galkhaite sphalerite What really happens? Can you explain it? Once again these would be useful starting materials due to high abundance BUT not in terms of stability and purity! Examining the Main Group Group 13 or Group 13 or III III A or 3A A or 3A Elemental or MOST PURE form IE B considered non-metal - Sharing is localized - Why most compounds are covalent Al Ga, In, Tl metals and semi-metalloids- Sharing is both localized & delocalized member nomaliesare f rhombohedral cp cp tetragonal remember anomaliesare of chemical interest ; B*, Ga and Tl, ccp hcp orthorhombic Looking at trends for the group of elements .. Examining the Main Group...
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group13post - Group 13 or Group 13 or III III A or 3A A or...

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