[SOLVED] Which of the following was not a part of Dalton’s atomic theory?

Which of the following was not a part of Dalton’s atomic theory?

1. Group of answer choices Each element is composed of atoms, which are identical for that element. 
2. The reactivity of elements involves changes in their electron configuration. 
3. Chemical combination is the bonding of a definite number of atoms of each of the combining elements. 
4. No atoms are gained, lost, or changed in identity during a chemical reaction.