12. Use your Periodic Table and locate the element that is in Group 18, in the second Period. A. What is the name of that element?
B. What is the name of the Group that element is in?
C. What is the state of matter (solid, liquid or gas) of that element?
D. What is the reactivity of that element?

The speed of sound in ice, water, and steam is shown. what best explains the speed of sound in different states of matter? sound travels fastest in ice because energy is easier to transfer when the molecules are close together. sound travels slowest in steam because the sound has to move around the gas molecules that are far apart. sound travels fastest in ice because the temperature of solids is always greater, so the heat transfers the sound energy. sound travels slowest in steam because the pressure is so great the sound cannot travel though the steam particles.

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?