Answer: oxide

AnswerCrossword Clue
OXIDE

Calcium .. (lime)

OXIDE

Rust, for one

OXIDE

Zinc-....

OXIDE
Common chemical compound
OXIDE
Nitrous ... (laughing gas)
OXIDECompound containing the eighth element (yes, another chemistry clue)
OXIDEFerric .. (Fe203)
OXIDEZinc ... (lotion ingredient)
OXIDELime or rust
OXIDEZinc ..
OXIDERust, e.g.
OXIDELime or rust, e.g.
OXIDERust, actually
OXIDEIron ..
OXIDECommon compound
OXIDERust, say
OXIDENitrous ..
OXIDECalcium ... (lime ingredient)
OXIDERust or lime
OXIDEIron ... (rust)
OXIDERust, for example
OXIDELime, for example
OXIDEDeuterium ... (heavy water)
OXIDENitrous ...
OXIDERust, for instance
OXIDERust, tarnish, or laughing gas
OXIDELaughing gas, e.g.
OXIDELaughing gas, for one
OXIDEZinc ...
OXIDEFerric ... (rust)
OXIDEZinc ... (healing ingredient)
OXIDERust or water, chemically
OXIDENitrogen ...
OXIDEZinc ... (sunblock substance)
OXIDECompound such as rust, to a chemist
OXIDERust or laughing gas
OXIDEOxygen compound
OXIDEChemical compound
OXIDEIron compound
OXIDEFerric ...: rust