Answered

which number tells you the number of valence electrons

Sagot :

AwesomeHelperid
The number in the periodic table that tells the number of valence electrons is the group number that we can see above the columns. 
Roietemillenaid
the family no. if the family number for example is IIA it means that the element has two valence electrons and the orbital that corresponds to the valence electrons is either S orbital or P orbital, in IIB, the element has still two valence electrons but the orbital is either the D or F orbital