B: green flame | 13
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An anhydrous white salt, Z, is heated strongly for 30 minutes. A mixture of gases is given off. The solid remaining i…
In Group 2 of the Periodic Table, the properties of the elements and their compounds show regular change down the gro…
Four properties of beryllium, Be, or a beryllium compound are listed. Which property is different from the property o…
Ethanedioic acid is a white crystalline solid. If excess aqueous potassium hydroxide, KOH(aq), is added to dilute eth…
The first ionisation energy of potassium, K, is 418 kJ mol⁻¹. The first ionisation energy of strontium, Sr, is 548 kJ…
What is the electronic configuration of Mg²⁺?