As you watch a campfire, you will sometimes see some of the flames are yellow while some are blue or orange. Why is this?

Which of the following elements would you expect to have the lowest ionization energy value? fluorine, lithium, neon, nitrogen

What is the ima of the 1 st class lever in the graphic given? 2 3 0.5

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: