Which of the following best describes the electron cloud model? a. it shows that electrons usually carry a negative charge. b. it shows that electrons remain in high-energy subshells. c. it shows that electrons move quickly in circular orbits. d. it shows that the electrons within an atom do not have sharp boundaries.

Which of the following best describes the electron cloud model?

THE ELECTRON CLOUD MODEL WAS DEVELOPED BY SCHRODINGER. IT STATES THE THE ELECTRONS ARE NOT PARTICLES MOVING AROUND THE NUCLEUS IN FIXED ORBITY BUT THEIR LOCATIONS CAN ONLY BE STATED BY A PROBABILITY DENSITY IN FORM OF CLOUD AROUND THE NUCLEUS. 

THEN THE MAIN POINT OF THE CLOUD MODEL IS THAT THE ELECTRONS ARE NOT IN FIXED ORBITS AROUND THE NUCLEUS BUT THEIR LOCATION IS STATED BY A PROBABILITY FUNCTION THAT IS LIKE A CLOUD REGION.

A. It shows that electrons usually carry a negative charge.

FALSE: ELECTRONS ALWAYS CARRY NEGATIVE CHARGE

B. It shows that electrons remain in high-energy subshells.

FALSE: ELECTRONS OCCUPY THE LOWEST-ENERGY SUBSHELLS AVAILABLE UNLESS THEY ARE EXCITED (ABSORB ENERGY)

C. It shows that electrons move quickly in circular orbits.

FALSE: ELECTRONS DO NOT MOVE IN CIRCULAR ORBITS.

D. It shows that the electrons within an atom do not have sharp boundaries.

TRUE. THE IDEA OF A CLOUD IS A DIFFUSSE REGION WHERE IS A 90% OF PROBABILITIES TO FIND THE ELECTRON, AND THEY DO NOT HAVE SHARP BOUNDARIES.

Both models are effective because they show the valence electrons, and these valence electrons indicate the reactivity of an element.