How would you describe the following chemical reaction? 2H2O(l)+ Energy --> 2H2(g) + O2(g)

a) exothermic
b) endothermic

What happens to isotopes that are unstable?

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space

What is the lowest number energy level where a d sublevel is found