Which element have the same lewis dot structure as silicon ?

You just look at what vertical row that silicon is, and every element that is in the same vertical row as silicon will have the same lewis dot structure...and this applyes for most elements on the periodic table of elements.                        
 - C, Ge,Sn, Pb:                                                                                                  
all these elements are in the same column, and therefore have the same number of valence electrons

Adozen is 12, and your needing to calculate the weight of one medium egg, so i would do 21/12=1.75 per egg, and check your answer by doing 1.75 * 12= 21 : ) : ): ): ): ) i hoped i