The Development of Atomic Theory

If the electrons are given energy, the electrons in an atom could absorb energy by jumping to a higher energy level, or excited state.

• Niels Bohr

• John Dalton

• J.J Thomson

• Modern atom

• Democritus

The energy level at which electrons circulate is called the atomic shell.

• Rutherford

• Niels Bohr

• Modern Atom

• J.J Thomson

• John Dalton

The electronic structure of the atom as the probability of finding electrons within certain regions of space (orbitals).

• J.J Thomson

• Rutherford

• Modern Atom

• Niels Bohr

• John Dalton

Atom is a sphere in which the positive charges spread out evenly in the atom are neutralized by the negative charges positioned among the positive charges.

• Rutherford

• John Dalton

• Niels Bohr

• J.J Thomson

• Modern atom

He believed that all matter in the universe are made up of indivisible units known as 'atomos'.

• Democritus

• Dalton

• Mendeleev

• Moseley

Who discovered the negatively charge of an atom known as electron and proposed the Plum Pudding Model to describe the structure of an atom?

• Chadwick

• Goldstein

• Thomson

• Rutherford

Who discovered the neutral charge of an atom known as neutron?

• Chadwick

• Goldstein

• Thomson

• Rutherford

Who discovered the center of an atom known as nucleus which is a positively charged using the Gold Foil Experiment?

• Chadwick

• Goldstein

• Thomson

• Rutherford

He gave us the early idea about compound. According to him compounds are made up of two or more atoms of the same or different elements.

• Democritus

• Dalton

• Mendeleev

• Moseley

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He discovered isotopes of different elements proving that one element may have different atoms.

• Becquerel

• Milikan

• Bohr

• Soddy

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