Answer:
I^ -1 configuration is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6
Explanation:
The electron configuration of iodine is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p5, but with the addition of an electron it gains another other to make it 5p6.
A. repetition of their physical and chemical properties when arranged according to increased atomic number
hydrogen
A. Reactants change into products
