The three main groups of elements are metals, nonmetals, and Noble gases.
(A)
(B)
(C)
(D)
Isotopes.
Alkali metals.
Metalloids

Agas is contained in a thick walled balloon when the pressure changes from 1.21 atm to 2.52 the volume changes from 3.75 l to 1.72 l and the temperature change from 293k to blank k

Which statement is usually true about the relationship between activation energy and reaction rates? low activation energy barriers result in low rates. high activation energy barriers result in low rates. low activation energy barriers result in no reaction. high activation energy barriers result in no reaction.

Which of the following electromagnetic waves can create ions?