The kinds of atoms in the substance and their arrangements
Janice is the one who learned something by watching what was going on in the world around her.
Iodine, chloride, and bromide
Answer: J.J Thomson
Explanation: J. J. Thomson, who discovered the electron in 1897, proposed the plum pudding model of the atom in 1904 before the discovery of the atomic nucleus in order to include the electron in the atomic model.
