helium: a very light colorless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in Texas and Kansas)
chemical element: any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
judgment lien: lien on a debtor's property that is granted to a creditor by court judgment; lien may be enforced by having the sheriff seize the property and hold a sheriff's sale