Answer :
The first vertical row of elements are all alkali metals with the exception of hydrogen which is a transition metal.
The elements are:
Hydrogen(H) with an atomic number of 1
Lithium(Li) with an atomic number of 3
Sodium(Na) with an atomic number 11
Potassium(k) with an atomic number 19
Rubium(Rb) with an atomic number of 37
Cesium(Cs) with an atomic number of 55
Fracium(Fr) with an atomic number of 87
