What element blackens when exposed to oxygen?

Compare and contrast the bohr model and the electron cloud models of the atom.

If two objects at different te,peraure are in contact with each other what happens to their temperature

4. a 20-kg child is tossed up into the air by her parent. the child is 2 meters off the ground traveling 5 m/s. circle one: ke / gpe / both show your work for finding the values of each type of energy the object has: