An atom of element x has one more shell of electrons than an atom of beryllium, but it has one less valence electron than beryllium. which element is element x? a. sodium (na)
b boron (b)
c. magnesium (mg)
d. lithium (li)

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

State the following: boyle's law and charle's law

Abird flies directly overhead from where you stand at an altitude of 300.0 m and at a speed horizontal to the ground of 20.0 m/s. the bird has a mass of 2.0 kg. the radius vector to the bird makes an angle \thetaθ with respect to the ground. the radius vector to the bird and its momentum vector lie in the xyxy-plane. what is the bird’s angular momentum about the point where you are standing?