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| 1. |
Nobal gas |
| Answer» Noble gases are sometimes called inert gases, and they are the elements in Group 18 of the periodic table. They comprise the elements helium, neon, argon, krypton, xenon, and radioactive radon, which has no known stable isotopes.\xa0These gases are found as single atoms as they do not like to interact with other atoms on the periodic table, hence the name inert. Their outer-most electrons shells (valence shells) are completely full with eight electrons (save helium with two), which defines the chemistry of these elements.\xa0There are six noble gases:\tHelium (He)\tNeon (Ne)\tArgon (Ar)\tKrypton (Kr)\tXenon (Xe)\tRadon (Ra)\xa0 | |