Question

how to predict the period number of a d block element?? ​

Answer 1

Answer:

)For s block elements ,group number is equal to the number of valence electrons. b) For p block elements ,group number is equal to 10+number of electrons in the valence shell. c)For d block elements ,group number is equal to the number of electrons in a (n-1) sub shell + the number of electrons in valence shell.