| 100% | ARGON | 5 | Most common inert gas in the atmosphere |
| 82% | ARGON | 5 | Most common noble gas in the atmosphere |
| 69% | ARGON | 5 | Inert gas in the atmosphere |
| 66% | ARGON | 5 | Most abundant noble gas in the atmosphere |
| 59% | ARGON | 5 | Most abundant noble gas in the earth's atmosphere |
| 57% | NITROGEN | 8 | Most prevalent gas in the Earth's atmosphere |
| 56% | ARGON | 5 | Third-most abundant gas in the atmosphere |
| 56% | ARGON | 5 | Most common inert gas |
| 55% | ARGON | 5 | Inert gas in the air |
| 53% | ARGON | 5 | #3 gas in the atmosphere |
| 53% | AIR | 3 | Invisible gases in the atmosphere |
| 53% | DIOXIDE | 7 | Carbon __; greenhouse gas in the atmosphere |
| 51% | OZONE | 5 | Gas in a layer of the atmosphere |
| 50% | OZONE | 5 | Protective gas in the upper atmosphere |
| 49% | LEE | 3 | Most common last name in the world |
| 49% | ENG | 3 | Most common spoken language in the US: Abbr. |
| 49% | ACNE | 4 | Most common skin condition in the U.S. |
| 49% | OPOSITIVE | 9 | Most common blood type in the U.S. |
| 49% | SMITH | 5 | Most common last name in the United States |
| 49% | MAIN | 4 | Most common street name in the U.S. |
| 49% | ARGON | 5 | Most common of the noble gases |
| 48% | ARGON | 5 | Third-most abundant gas in the Earth's atmosphere, after nitrogen and oxygen |
| 48% | CALCIUM | 7 | Most common mineral in the human body |
| 48% | SMITH | 5 | Most common surname in the U.S. |
| 48% | THE | 3 | Most common word in the English language |
| 47% | NITROGEN | 8 | Most common element in the air we breathe |
| 47% | MARY | 4 | Most common girl's name in the 1950s |
| 47% | NEON | 4 | Inert gas used in many electric bar signs |
| 47% | SMITH | 5 | The most common last name in the U.S. |
| 47% | OREO | 4 | Most common cookie in the New York Times crossword |