Sagot :
Answer:
Element Atomic Electronic
Number Configuration
Hydrogen. 1 1
Helium 2 2
Lithium. 3 2,1
Beryllium 4 2,2
Boron 5 2,3
Carbon 6 2,4
Nitrogen 7 2,5
Oxygen 8 2,6
Fluorine 9 2,7
Neon 10 2,8
The elements of these groups are called representative elements.