Answer:
A). An atom is an indivisible hard-sphere.
Explanation:
The 'Atomic Theory' of Dalton is characterized as the earliest model(came in 1803) which described the atoms as the indivisible and resistant spheres. He used the example of watermelon to elaborate that the atoms of a specific element share similar characteristics and the atoms of distinct elements differ in their mass as well as their size. Thus, option A is the correct answer.
The statement that describes the earliest model of the atom is: A. An atom is an indivisible hard sphere.
An atom can be defined as the smallest, indivisible, basic unit of matter that forms all chemical elements. Thus, an atom is the fundamental (basic) building blocks of matter i.e all physical and chemical substances.
Additionally, an atom defines or determines the structure of a chemical element.
Basically, an atom comprises three (3) main particles and these are;
The earliest (first model) of an atom was proposed by a notable English chemist called John Dalton. In the early 1800s, John Dalton adopted Democritus' theory to formulate the earliest (first model) of an atom.
Dalton's atomic theory described the atom of a chemical element as an impenetrable, movable, indivisible, very small (tiny) but movable hard sphere i.e it cannot be divided into subatomic or very tiny particles.
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