The d-block elements in the Periodic Table are located in groups 3 to 12. They are transition metals that have partially filled d orbitals.
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The element 'H' is hydrogen, and is NO. 1 in the Periodic Table.
Element 56 on the periodic table is Barium (Ba).
There is no element with the symbol "Hn" in the periodic table of elements. The symbol "Hn" does not correspond to any known element.
84th element is polonium (Po). It is in the same Group as Oxygen.
To identify the valence electrons of an element on the periodic table, look at the group number of the element. The group number indicates the number of valence electrons. For example, elements in Group 1 have 1 valence electron, elements in Group 2 have 2 valence electrons, and so on.