Question

what is s p d f in periodic table ?

Answer 1

A block of the periodic table of elements is a set of adjacent groups. The term appears to have been first used by Charles Janet. The respective highest-energy electrons in each element in a block belong to the same atomic orbital type.

Answer 2

  The symbols s p d f in the periodic table are the electron orbitals in atoms of the elements.  The blocks in the periodic table are labeled s block , p block , d block and f block.

   s orbit can have 2 electrons in it. The group 1 and 2 are part of s block.

    The groups in p block have in p orbitals from 1 to 6 electrons varying across the horizontal period.  The number of s electrons remain the same.

     The d block contains elements with electrons in the outermost orbit varying from 1 to 10 electrons in the d orbitals.

    The f block contains elements with electrons varying from 1 to 14 in the f orbitals, across the horizontal period.