E-Storeinorganic for my frnz.................
11 May 2007 13:54:16 IST
inorganic for my frnz.................
some points about groups and periods in chemistryyyyyyy......
1)elements of second period are called bridge atoms..
2)their properties resembles with diagonal element of third period
3)elements of third period are called typical elements
4)for iso electronic ions , size depends on nuclear charge....greater the nuclear charge , smaller is the size
5)ionization energy always has a +ive value
6)Most of E.A are +ive , however some of elements like He have -ive value of 1st I.E.
7)effective nuclear charge = Z - S...(z = nuclear charge , s = screening constant)
8)E.A decreases frm top to bottom in a grp and inc. left to rite in a period
9)E.A of exactly half filled orbitals is approx. zero and exactly zero for fully filled configuration
10)more is E.A. greater is oxidising power
11)In mullikan scale....................
electronegativity = (Ionisation energy + electron affinity) / 2
12)pauling and moolican scale
pauling = moolican / 2.313)electro negativity depends..........
1)Oxidation state = it increases as the + ive oxdn state increases
2)hybradisation = greater the s-character , more is electronegativity
14)If the electro-ivity diff ................
a) greater than 1.7 then bond is ionic
b)less than 1.7 then bond is covalent
c)equal to 1.7 then it is 50% ionic , 50%covalent
d)zero , then bond is 100% covalent
e)no 100% ionic bond is there
no copy pasted...................jst self writtennnnn.........hope this helps and i m sure they will
Comments (10)
11 May 2007 14:06:22 IST
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gr88888888 post........................Himanshu..................gud work
11 May 2007 14:26:51 IST
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gr888888888 post................nd thats 1.7 only
sure
sure
11 May 2007 16:44:05 IST
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Himanshu, i too think the electro negativity diff should be 1.9
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