Question

Which of the following is NOT a part of Dalton's atomic theory?
a
Atoms are always in motion.
b
Atoms of the same element are identical.
c
Atoms that combine do so in simple whole-number ratios.
d
All elements are composed of atoms.

Please answer it, its a big test grade.

Answer 1

Answer:

option a = Atoms are always in motion.

Explanation:

John Dalton gives atomic theory in 1808. The main postulates are following,

1 = All mater is composed of indivisible  particle called atom.

2 =The atoms of same element are identical, but differ from another element.

3 = The atoms of different elements are combine in fixed proportion and form compound.

4 = Atom can not be created nor destroyed.

5 = Atom is smallest part of an element that take part in chemical reaction.

From above Dalton theory postulates it can be seen that all options are correct except option A.