What is an atom called when the number of neutrons changes?

At 300 mm hg, a gas has a volume of 380 l, what is the volume at standard pressure

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

The identities of substances are the same before and after which type of change