Which of the following on the periodic table corresponds to a principal energy level? Group of answer choices

representative elements

transition elements

group

period

How is it possible for someone to put an ear to a wall and hear someone in the next room?     a.sound waves can travel though solids.    b.the waves travel from room to room via air.    c.there must be some air in the wall so the sound can travel through it.    d.sound waves change to electromagnetic waves and then back again.

Which of the following is a property of nonmetals? a.nonmetals are ductile. b.nonmetals have a shiny luster. c.nonmetals have high density. d.nonmetals are nonconductors.

What amount in moles does 242 l of carbon dioxide occupy at 1.32 atm and 20 degrees c?