(a)[1]
An element that produces an ion with charge $3-$.
(b)[1]
Any element from the transition series.
(c)[1]
A gas for which limewater is the test.
(d)[1]
About $78\%$ of clean, dry air.
(e)[1]
Used for electrical wiring.
(f)[1]
The metal that is least reactive in the list.
(g)[1]
A diatomic molecule that is solid at room temperature and pressure.
(h)[1]
A compound that combines with impurities in the blast furnace to make slag.
(i)[1]
An element having a relative atomic mass of $12$.