Can any one explain how to make an electron configuration please??;-; like this question:

Use the electron configuration notation of the following elements to the determine their group, period and block
((1s22s22p63s23p64s23d5))

1.Group 7,Period 4,d-block
2.Group 2,Period 4,s-block
3.Group 7,Period 3,d-block

each  column  of the  table  is called a group. elements in a group share similar properties. groups are  read  from  top  to  bottom. metal. metalloid. nonmetal. solid. liquid. gas. fe. hg. o.  2. 3. 4. 5. 6. 7. 8. 9.  2. beryllium. 9.012. 4.  sodium. 22.990.  11. 3.  magnesium. 24.305.  12.  potassium. 39.098.  19. 4.  calcium. 40.078.  20. i guess  i  

explanation:

a