Maximum,meaning the most. And ion,which is an atom or group of atoms with an electrical charge.

VOA: special.2010.05.30

Hydroxyl is the combination of one hydrogen atom and one oxygen atom.

VOA: special.2009.09.30

Water is made of one oxygen atom and two hydrogen atoms.

VOA: special.2009.09.30

If dark matter particles exist, scientists say, they should be able to observe a small amount of light given off when they hit the nucleus of a xenon atom.

VOA: special.2009.07.21

Without knowing it, he had split the atom.

VOA: special.2009.06.14

Iran says its nuclear program is for peaceful purposes, but Steinitz says Israel has proof that the Islamic Republic is building the atom bomb.

VOA: standard.2009.12.28

Iran says its nuclear program is for peaceful purposes, but the United States and Israel believe the Islamic Republic is trying to acquire the atom bomb.

VOA: standard.2009.07.26

More powerful particle accelerators atom smashers, they used to call them have allowed physicists to learn ever more about the sub-atomic particles that are the basic building blocks of all matter.

VOA: standard.2010.03.05