A student makes three statements. 1 Calcium ions have a 2+ charge and oxide ions have a 2- charge. 2 Magnesium ions and oxide ions have the same electronic configuration as neon. 3 Calcium ions have three full electron shells and magnesium ions have two full electron shells. Which statements are correct?

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…