Which element has 7 valence electrons?

a nitrogen (N)

b neon (Ne)

c lithium (Li)

d chlorine (Ci)

A car travelling at 45 mi/hr (20.1 m/s) comes to rest in 4 seconds. Find the acceleration of the car in m/s2.

If she wants to bike 220 km, how long (in hours) must she ride? a cyclist rides at an average speed of 25 miles per hour.

What is Plancks constant (h) ?

If the width of the plasma membrane is approximately 5 nm, and the electric field is constant throughout that width, what is the electric force acting on a sodium cation as it passes from the extracellular space to the intracellular space through a

Describe your motion in terms of velocity and acceleration as you ride in a car down the street, come to a red light, wait for the green light and then start off again.

The index of refraction of silicate flint glass for red light is 1.620 and for violet light is 1.660. A beam of white light in this glass strikes the glass-air interface at a 25.50∘ angle of incidence and refracts out into the air.

The locations of the major pressure and wind systems on the earth:

Which statements correctly describe the properties of heat? Select all that apply. Heat is an essential component of life on Earth. Heat is energy that flows from one object to another. Heat flows from a hotter object to a colder one.

A book is sitting on a table at rest. Which of the following best describes the forces acting on the book? A.

When NASA's Skylab reentered the Earth's atmosphere on July 11, 1979, it broke into a myriad of pieces. One of the largest fragments was a 1770-kg lead-lined film vault, and it landed with an estimated speed of 120 m/s.?