This element is found in period 2, group 15. this nonmetal is the fifth most abundant element in the universe and makes up 78% of earth’s atmosphere. what is the atomic number and name of this element? *

Which statement about sound is not true? a. air particles travel with sound waves. b. sound waves cannot travel through a vacuum. c. sound waves exist even if no one hears them. d. air particles vibrate along the path of a sound wave.

Noble gases are the most reactive elements on the periodic table. a. true b. false

What type of reaction is zn + cucl2 → cu + zncl2?