Write the electronic configuration of the element with the atomic numbers 61,91,100 and 109.

Explanation

Promethium )=(Pm)=61=[(Xe)]: 4 (f)^(circ) 6 (~s)^(2)
Protacținium )=(Pa)=91=[(Rn)] 5 (f)^(2) 6 (~d)^(t) 7 (~s)^(2)
Mendelevium )=(Md)=(IO) (I)=[(Rn)] 5 (f)^(t)/( )^(3) 7 (~s)^(2)
Meịnerium )=(Mt)=109=[(Rn)] 5 (f)^(1) 6 (~d)^(2) 7 (~s)^(2)