Question

What are three main ideas in Dalton's atomic theory? Check all that apply.

Atoms combine to form compounds in simple, whole number ratios.

Most of the atom's mass and all of its positive charge are contained in a small core called the nucleus.

Most of the volume of the atom is empty space through which the tiny, negatively charged electrons are dispersed.

There are as many negatively charged electrons outside the nucleus as there are positively charged particles (protons) inside the nucleus, so that the atom is electrically neutral.

All atoms of an element are identical, and each element has unique atoms.

Elements are composed of atoms.

Answer 1

The three main ideas of Dalton Theory -

1)Elements are composed of atoms.

2)All atoms of an element are identical, and each element has unique atoms.

3)Atoms combine to form compounds in simple, whole number ratios.

The 3rd idea is the most unique idea and up to now , all the ideas of Dalton has been proved incomplete and error except the third one .

Actually , Dalton assumed atoms to be unbreakable particles , later scientists proved this to be wrong , atoms are definitely breakable to sub-dimensional particles .

Most of the atom's mass and all of its positive charge are contained in a small core called the nucleus. - this is an idea of Rutherford via gold foil experiment .

Most of the volume of the atom is empty space through which the tiny, negatively charged electrons are dispersed.-this is also an idea of Rutherford via gold foil experiment .

So , these two are not Dalton's idea , these are little advanced.