Historical Development of Atomic Theory.

What did the early atomic theory propose about the nature of matter?

It proposed that the universe is made of tiny, indivisible particles called 'atomos' (atoms) that move through an infinite 'void' (empty space).

What are the limitations of the early atomic theory regarding the indivisibility of atoms?

Modern science has proven that atoms are not indivisible.

What is the plum pudding model of atomic theory?

It proposed that an atom is a sphere of positively charged matter with negatively charged electrons embedded within it, similar to plums in a pudding. It was later proven false

What does the nuclear model of atomic theory describe?

It describes an atom as having a tiny, dense, positively charged nucleus at its center, with negatively charged electrons orbiting around it.

How do electrons orbit the nucleus according to the fixed energy levels concept?

Electrons orbit the nucleus in fixed, discrete energy levels, or 'shells,' rather than following any random path.

What does the quantum mechanical model of atomic theory suggest about electrons?

It describes electrons as waves in three-dimensional space, replacing the classical idea of fixed orbits.

What is the atomic mass formula?

Average Atomic Mass = mass (1) x abundance (%1)+mass(2)x abundance(%2)

who suggested the first atomic theory?

Democritus

who created the plum pudding model?

J.J. Thompson

who suggested the nuclear model?

Ernest Rutherford 

who developed the Bohr Theory

of the Atom?

Niels Bohr

who suggested the early atomic model

John Dalton