Which pair of properties describes the elements in Group 18? F They are chemically stable and
liquid at room temperature.
G They have eight valence
electrónico and flammable.
H They are magnetic and boil at
low temperatures.
J They are gaseous at room
temperature and chemically
stable.

i believe the answer would be b. hope it : )

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.

a plastic spoon that has a temperature of 78° f is placed into a bowl of soup that has a temperature of 84° f. which of these correctly describes what will happen?

energy as heat moves from the soup to the spoon.