Question

block and valencies of the
the period ,group ,valency
Write
following
cu29​

Answer 1

THERE are 4 blocks in the modern periodic table of elements ,they are s-block ,p -block,d -block and f -block.

the group number shows valency of their elements ,like valency of group 1 is 1 ,valency of group 2 is 2 ,valency of group 3 is 3 etc