Which statement best describes the arrangement of electrons in an atom of fluorine (F)?

A. There are two electrons in the first energy level and five electrons in the second energy level.
B. There are two electrons in the first energy level and seven electrons in the second energy level.
C. There are seven electrons in the first energy level and two electrons in the second energy level.
D. There are five electrons in the first energy level and two electrons in the second energy level.

Road users moving into your lane, brake lights, and abrupt changes in road surface are a. rare at night b. indicators of potential hazards c. not worth worrying about before you reach them d. no problem for experienced drivers

Which accurately compares concave and convex lenses?

As part of your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. when you push the platform, you compress the springs. you do an amount of work of 79.0 j when you compress the springs a distance of 0.230 m from their uncompressed length. (a) what magnitude of force must you apply to hold the platform in this position? (b)how much additional work must you do to move the platform a distance 0.230 m farther? (c) what maximum force must you apply to move the platform a distance 0.230 m farther?