Development of Atomic Models

A timeline of some models of atoms throughout history is shown. These models have contributed to the formation of the atomic theory. Which statement best summarizes the development of the atomic theory over time?

• The discovery of new evidence resulted in changes to the atomic theory.

• Advancements in atomic models proved the atomic theory was accurate.

• The atomic theory was modified with the discovery of every new element.

• Changes in atomic models showed that the atomic theory was based on opinion.

A scientist conducts an experiment on the structure of atoms. The results of the experiment seem to disprove parts of the accepted atomic theory. After the scientist publishes the results, other scientists conducting the same and similar experiments obtain similar results. Which of the following will most likely happen?

• The accepted atomic theory will be changed.

• The atomic theory will continue to be accepted as it is.

• The results of the new experiments will be disregarded.

• The accepted atomic theory will be completely discarded.

Neon (Ne) is an element, one of many different kinds of matter that occur on Earth. The diagram shows a model of one atom of the element neon. The diagram is one kind of scientific model. Which of the following is the main advantage of this model?

• It is the same size as the object it represents.

• It accurately shows all the parts of the object it represents.

• It represents a three-dimensional object on a flat piece of paper.

• It represents an object too small to be seen even with most microscopes.

Tags

NGSS.MS-PS1-1

This is the most complete and current model of the atom. It consists of 61 elementary particles. Electrons are located in complex orbitals.

• The "Quantum Mechanical Model" of the atom

• The "Rutherford Model" of the atom

• The "Plum Pudding Model" of the atom

• The "Bohr Model" of the atom

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

This model added on to previous models by showing electrons existed at certain "energy levels". It is often called the Planetary Model.

• The "Bohr Model" of the atom

• The "Rutherford Model" of the atom

• The "Plumb Pudding Model" of the atom

• The "Quantum Mechanical Model" of the atom

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

This model was developed after J.J. Thompson discovered electrons, a particle smaller than an atom. Is shows electrons floating freely in a positive space.

• The "Plum Pudding Model" of the atom

• The "Rutherford Model" of the atom

• Democritus's model of the atom

• The "Quantum Mechanical Model" of the atom

What can you conclude from the fact that scientists continue to update the atomic model?

• New information about atoms continues to be discovered

• Old information about atoms is completely useless

• Scientists did not have any information about atoms until a few years ago

• Scientists still have no idea what atoms look like

Tags

NGSS.HS-PS1-2

Who proposed that electrons move around the nucleus in circular orbits?

• Dalton

• Thomson

• Rutherford

• Bohr

Which of the following has the atomic models in the correct Chronological order?

• Solid sphere, Plum pudding, Nuclear, Planetary, Quantum Mechanic/Electron Cloud

• Solid sphere, Plum pudding, Nuclear, Quantum Mechanic/Electron Cloud, Planetary,

• Plum pudding, Nuclear, Planetary, Quantum Mechanic/Electron Cloud,Solid sphere

• Nuclear, Planetary, Solid sphere, Quantum Mechanic/Electron Cloud,Plum pudding,

This was the first model of the atom ever proposed. It was simple and described atoms as tiny spheres that could not be broken down into smaller pieces.

• Democritus's model of the atom

• The "Plum Pudding Model" of the atom

• The "Rutherford Model" of the atom

• The "Quantum Mechanical Model" of the atom