Rules to find the atomic no. of middle elements are as follows:
1)Take odd no. of elements such as 3 elements or 5  elements etc.
2)The first and the last one's atomic no. will be given so to find the middle one's atomic no. do as follows 
i)If 3 elements are given suppose X,Y,Z where the atomic no. of X=16 & Z=18 then y's atomic no. will be 
Y=16+18/2
=>Y=17
ii)If 5 elements suppose V,W,X,Y,Z where V=32 & Z=36 then do as follows
here middle one is X
X=32+36/2
=>X=34
then W=32+34/2
W=33
Similarly Y=34+36/2
Y=35
Hence these are the rules you must follow to find it out 
Note:-Do not compare it with the laws of triads
 Discovered by,
Adityam Ghosh And Pratik Banerjee

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isn't it is marvelous 

Chemistry,the goddess of all subject

"Chemistry is a subject to love because she is magnificent and she is made like this only by the creator"-Adityam Ghosh



This post is from my view to Chemistry .  

Jokes

An aged lady had a heart attack and thereby she was admitted to hospital .Being standing in broken bridge of life and death she saw God and she asked God, "Is my time is up?" then God answered,"No, You have still 40 yrs to live and enjoy life" so she thanked God and came back to live and then she started making her look beautiful.On recovering she was discharged from the hospital and on his way to home she was being hit by a car and thereby she died & thereby she went up to heaven and spoke to god "I thought you told me that I have still 40 yrs to live then why did you pull me up" then God told to her,"Sorry my dear I didn't recognize you"