(a)[1]
Identify the element that is produced in photosynthesis.
(b)[1]
Identify the element whose oxide is found in clean, dry air.
(c)[1]
Identify the element that forms a basic oxide with the formula $X_2O$.
(d)[1]
Identify the element that is a major component of fertilisers used to help crop growth.
(e)[1]
Identify the element with the greatest rate of diffusion at room temperature.
(f)[1]
Identify the element that gives a red flame in a flame test.
(g)[1]
Identify the element whose atoms each contain only 5 electrons.
(h)[1]
Identify the element whose oxide is responsible for acid rain.