The element phosphorus, P, is immediately below nitrogen in the Periodic Table. It forms an oxide with the empirical formula P2O5. From the position of phosphorus in the Periodic Table, the element is expected to be ......1...... and the bonds in its oxide to be ......2....... Which words correctly complete gaps 1 and 2?

Which row shows the correct number of protons and electrons in the ion of an element in Group II of the Periodic Table?

A drop of liquid bromine is placed in the bottom of a gas jar. Brown fumes of bromine vapour slowly spread through th…

Which statement about both chlorine atoms and chloride ions is correct?

Petroleum is separated into fractions by fractional distillation. Which fraction distils off at the highest temperature?

Ammonia is made by a reversible reaction between nitrogen and hydrogen. N₂(g) + 3H₂(g) ⇌ 2NH₃(g) ΔH = −92 kJ/mol What…

Aqueous copper(II) sulfate is electrolysed using copper electrodes. The current is constant and the anode (positive e…