Which element has 7 valence electrons? a. nitrogen (n) b. neon (ne). c. lithium (li). d. chlorine (cl)

In the image, the arrow is pointing to a celestial object. which attribute disqualifies the object from being a planet?

True or false: the cycle of seasons on the earth is caused by the tilt of the earth on its axis toward and away from the sun.

Scientists follow specific processes in order to determine valid explanations and conclusions from observations. david observed strange lights in the sky above his home outside of roswell, new mexico. the only explanation that makes sense to him is that there are ufos in the area. what should david do next to verify his explanation?