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| a colorless, flammable gas, C4H10, a saturated aliphatic existing in two isometric forms: used chiefly in the manufacture of rubber and as fuel |
| a compound capable of changing state or becoming inactive when subjected to heat or radiation |
| actinide series | |
| —n | |
| a series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium | |