huh,

How did Thomson's change Dalton's atomic model?*

1/1

• He added electrons that were spread throughout a positively charged sphere.

• He added electrons that were spread throughout a negatively charged sphere.

• He added neutrons that were spread throughout a negatively charged sphere.

• He added protons that were spread throughout a negatively charged sphere.

Why are scientific theories and models changed over time?*

• It is correct to change old theories and models without new evidence from experiments.

• Experiments showed evidence that some parts of previous models are incorrect.

• Theories and models are updated without evidence from experiments.

• Scientists propose new theories and models that copy other scientists.

What aspect of gold Rutherford's gold experiment changed the atomic theory? *

1/1

• He discovered at atom had a positively charged nucleus.

• Neutrons were added to stop the atom from collapsing.

• The quantum theory was applied to predict electron orbits.

• Electrons were added in a ball of protons as in the plum pudding model.

How are electrons arranged in Rutherford's atomic model? *

1/1

• Electrons are spread out in a positively charged sphere.

• Electrons are in a mostly empty space surrounding a positively charged nucleus.

• Electrons are in different energy levels that orbit the nucleus.

• Electrons are rearranged in chemical reactions.

Which is the correct theory or model for the atom at present day?*

• Protons, neutrons and electrons in random arrangement.

• A nucleus consisting of protons and neutrons with a cloud of electrons around it.

• A solid ball that is indestructible end indivisible.

• A positively charged sphere with electrons scattered throughout it.

Which scientist discovered electrons are arranged in different energy levelsaround the nucleus of an atom?

• Thomson

• Rutherford

• Dalton

• Bohr

Who was the first scientist to propose an atomic model that explained atoms are tiny indivisible and indestructible balls?*

1/1

• Bohr

• Thomson

• Rutherford

• Dalton

What was the last part of the atomic model that was discovered by Chadwick?*

1/1

• neutrons in the nucleus

• protons in the nucleus

• protons in shells

• electrons in shells

What model best represents Dalton's atomic theory?*

1/1

• the quantum theory

• plum pudding

• the solar system

• a ping pong ball

Choose the correct answer for the definition. "A representation of an idea, object, process or system that is used to describe and explain phenomena that cannot be experienced directly", for example how a rainbow is made.*

1/1

• scientific model

• atomic structure

• periodic table

• subatomic particles