Answer:
The existence of isotopes contradicts part of Dalton's original atomic theory because he said all atoms of a given element are identical have the same mass size and chemical properties.
Explanation:
Question 2
1) How are you?
2) Beunas Noches!
3) Beunas Tardes!
4) Fatal in English is the same as Fatal in Spanish.
5) Except times? I think