carbon is considered to be a special element |
2 |
Google Autocomplete, Answers.com Questions |
carbon is considered an element |
1 |
Google Autocomplete |
carbon still be considered a single element and can have different mass numbers |
1 |
Answers.com Questions |
carbon is considered a special element |
1 |
Answers.com Questions |
carbon is considered the most important element |
1 |
Answers.com Questions |
carbon is considered to be a versatile element |
1 |
Answers.com Questions |