A mixture doesn't have definite physical and chemical properties.
A mixture that doesn't have definite physical and chemical properties is a true statement.
A mixture does not have definite physical and chemical properties.
Give an example to show that constituents of a mixture always retain their physical and chemical properties.
isomers have different chemical physical properties? or similar chemical and different physical properties?
"It was also observed that there occurs a periodic recurrence of elements with similar physical and chemical properties." What does periodic recurrence of elements with similar physical and chemical properties mean?