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Give one example of eacha) Metal having valency 2. b) Non metal having valency 2. c) Element with completely filled outermost shell. d) d) Element with

three shells, having 4 electrons in the outermost shell.


Beryllium,sulphate,any noble gas (helium),i dont know the last one
0 0 0
a) magnesium  
b) oxygen
c) neon
d) silicon 
 i hope it helps....
2 5 2
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