Based on Dalton's atomic theory, which of the following is true about all atoms of the same element?

They have different masses.

They have the same properties.

They can be divided into molecules.

They are composed of visible matter.

The correct answer is "They have the same properties".

Explanation:

The second postulate of Dalton's atomic theory states that the atoms of the same element are all equal to each other in mass, size and in the rest of the physical or chemical properties. On the contrary, atoms of different elements have different mass and properties.

Have a nice day!

Dalton's atomic theory proposed that all matter was composed of atoms, indivisible and indestructible building blocks. While all atoms of an element were Identical, different elements had atoms of differing size and mass.

So it would be B: They have the same properties.