Which of the following lists contain only elements?
Aair, iron, iodine, magnesium.
Bzinc, gold, aluminium, oxygen.
Cnitrogen, copper, mercury, water.
DChlorine, argon, sodium, limestone.
Aair, iron, iodine, magnesium.
Bzinc, gold, aluminium, oxygen.
Cnitrogen, copper, mercury, water.
DChlorine, argon, sodium, limestone.