NY Regents Chemistry Exam August 2023
Which proposal in the development of the modern model of the atom was made before the others?
(1) Atoms are hard, indivisible spheres of different sizes.
(2) Atoms are mostly empty space with a small dense nucleus.
(3) Atoms have electrons that have wavelike properties.
(4) Atoms have an internal structure that contains negative particles
Solution: The earliest model of an atom (Thomson Model) proposed that an atom is an indivisible hard sphere.
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