Which of the following is an anion?
a. o^2-
c. al^3+
d. h

Different isotopes indicate that an element will have different numbers of

How did planetesmals form planets? a. they broke apart into smaller chunks.b. they collided and stuck together.c. they cooled and pulled ice together.d. they began to rotate.

What happens to the average kinetic energy of a gas when the particles of the gas collide against each other at a constant temperature and volume? explain your answer.