Question

2(b)(ii). State three postulates of Dalton's atomic theory. List two limitations of this theory in the study of the atom.

Accepted Answer

Postulates of Dalton's atomic theory:
(I) An atom is the indivisible part of an element.
(II) An atom can neither be created nor destroyed.
(III) Atoms of the same element are alike in every aspect and differ from atoms of other elements.
Limitations:
(I) An atom can still be divided into three sub-atomic particles (protons, neutrons and electrons).
(II) Atoms of the same element may not be exactly identical (the concept of isotopy illustrates this).

WAEC Chemistry 2015 Theory — Question 19

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