Z - method to write the trend of Ionisation Energy

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24 Oct 2010 01:17:11 IST
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24 Oct 2010 01:17:11 IST
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Z - method to write the trend of Ionisation Energy
Engineering Entrance , JEE Main , JEE Main & Advanced , academic , Chemical bonding

Hello dear friends ...After your responses ..I am submitting  a new trick in chemical bonding which i had used during my exam time.....Actually question is asked only to write the trend of some selective compounds...whole periodic table is necessarily not required to mugged up....Some famous elements like N O P...are only asked...So i am submitting here a method...by which you can easily find out the trend of Ionisation energy ....


My trick in confined to these compounds only...which are mostly asked...


Li                   B                      Be                         C                               O                                   N                             F

           Z                Z                     Z        Z           Z         Z

Na               Al                        Mg                       Si                                S                                  P                            Cl   


You need to remeber the way i have written.....it is not hard....because it is just the first two rows elements....except H and He ....


As we know   O <   N   ,   S   <   P   ,   B  <  Be     and  Al   <   Mg .....so i switched there position ......this is the imprtant thing in this...if you will miss this....then you will have to pay .....so my request...remeber that you have to switch the half filled orbital elements.....After that you will hit six  ...


Now Question will like this.. ?

a) Write the trend of I.E of the following compound ...?

~  P ,  S , O , N 

~ C Mg  Si  Be

~Be  Li  Na  Mg

~ S  Be  O   Mg

~Be Mg  Cl  F 


I will solve this for you...and then will give you some question...?


You must write the all the compounds with Z drawn ....

~consider the part where....P   S    O    N  is........

How is the Z  pattern......it starts from  O   goes  to  N  the  goes to S  and then to P ...


O                       N

          Z

S                       P


So just follow the line of Z with starting point at the left top tip of Z...


so Ionisation Energy trend will  be    O  <  N  <   S   <   P


~ C Mg  Si  Be 


Consider these four in the above patterns....How is the Z structure in between....starts from Be ,, goes to C  then to Mg then to Si...


So pattern will be   Be <  C  <  Mg  < Si


~Be  Li  Na  Mg 


Now look in the pattern...where these four compounds are located.....it is like this....


Li                     B                              Be


Na                  Al                              Mg      


when  the elements are not just side by side...no problem...just focus on the four elements...remove all from the middle....


So it is simply  


Li                                        Be



Na                                     Mg


Make a Z between them


Li                            Be

              z

Na                              Mg                     therefore trend is    Li  <  Be   <   Na   <   Mg


~ S  Be  O   Mg 


See where these elements are located ...


Be                                                                                                                      O                            Be                O

            (remove the middle elements consider only the four)                            =>                        Z

Mg                                                                                                                      S                             Mg                S


hence the trend is.....Be  <   O  <   Mg   <   S  


~ Be Mg  Cl  F  

these are located in the above pattern  as ...


Be                 F

         z            

Mg                Cl                      hence the trend is......Be <  F   <   Mg   <   Cl 


I have explained  it step by step...thats why it will seems to be very long /....but this is quite easy than what you all actually mug up....Once you write all the elements ...it will be very easy......Just write the compound in the form they are in the table...and write Z between them ...and follow the line of  Z you will get the trend....


I hope my effort is not useless for you guys...You all get my tricks or not   ? 


Here are few examples...which you can try...


1)Al   N  P   B      2)     Al   F   B   Cl          3) B  O   S    Al            4 )  Si   F  Cl    C           5) F  Cl  Na   Li  


And don't worry....All the trend which have been asked in JEE...(past years) are only of these compounds....and they ask from this only...


Comment on the article....with your doubts..

Regards

yagya


Comments (19)


Blazing goIITian

Joined: 6 Mar 2010 10:45:20 IST
Posts: 380
24 Oct 2010 08:04:37 IST
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Thnx sir, I got it.......

Blazing goIITian

Joined: 24 Jun 2010 22:11:10 IST
Posts: 581
24 Oct 2010 11:10:51 IST
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It got really,, really .......very easy....:)..hatts off to u yagya...

New kid on the Block

Joined: 24 Oct 2010 11:14:50 IST
Posts: 2
24 Oct 2010 11:26:49 IST
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Great attempt! :) Thanks dude...

New kid on the Block

Joined: 29 Jun 2009 13:21:07 IST
Posts: 12
24 Oct 2010 20:40:52 IST
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thnx a lot sir...n ur efforts r really precious fr us....

Hot goIITian

Joined: 7 Jul 2009 08:39:47 IST
Posts: 164
25 Oct 2010 07:45:50 IST
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Yup , I got it... THANKS...........

Blazing goIITian

Joined: 6 Mar 2010 10:45:20 IST
Posts: 380
25 Oct 2010 08:28:22 IST
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ans. 1. B

.
New kid on the Block

Joined: 23 Oct 2010 20:15:56 IST
Posts: 17
25 Oct 2010 08:30:44 IST
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It's really wonderful.........

Hot goIITian

Joined: 5 Apr 2010 12:20:28 IST
Posts: 119
25 Oct 2010 12:06:36 IST
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nice

Hot goIITian

Joined: 25 Jan 2009 00:19:10 IST
Posts: 176
25 Oct 2010 20:20:23 IST
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thanks yaar it is superb

Hot goIITian

Joined: 6 Oct 2010 15:37:54 IST
Posts: 148
26 Oct 2010 00:26:26 IST
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thnx a lot ...

New kid on the Block

Joined: 26 Oct 2010 01:00:28 IST
Posts: 3
26 Oct 2010 02:02:41 IST
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God bless you

.
Blazing goIITian

Joined: 11 Jun 2009 10:28:43 IST
Posts: 386
27 Nov 2010 08:30:54 IST
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wow!

Cool goIITian

Joined: 15 Feb 2010 19:37:58 IST
Posts: 47
27 Nov 2010 13:08:40 IST
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i have a doubt.If we take the last question(F Cl Na Li ), the trend should be Li

Cool goIITian

Joined: 15 Feb 2010 19:37:58 IST
Posts: 47
27 Nov 2010 13:11:08 IST
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the trend should be Li

Cool goIITian

Joined: 15 Feb 2010 19:37:58 IST
Posts: 47
27 Nov 2010 13:11:54 IST
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my doubt is not getting posted completely.

Cool goIITian

Joined: 15 Feb 2010 19:37:58 IST
Posts: 47
27 Nov 2010 13:13:24 IST
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it should be Li

Forum Expert
Joined: 19 Feb 2009 13:24:30 IST
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27 Nov 2010 16:00:05 IST
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Sorry Sandeep...didn't get time to come here....=========================for last part.... Li < F < Na < Cl ( answer) ..// I.O of Li = 3 , I.O (F)=9 I.O of Na = 11 I.O Cl = 17//

Cool goIITian

Joined: 15 Feb 2010 19:37:58 IST
Posts: 47
29 Nov 2010 12:33:28 IST
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Cool goIITian

Joined: 15 Feb 2010 19:37:58 IST
Posts: 47
29 Nov 2010 12:34:57 IST
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the above page suggests that the order of F and Na should be reverse.Can you please explain this?



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