C: Sc³⁺
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This question refers to isolated gaseous species. The species F⁻, Ne and Na⁺ are isoelectronic. This means they have …
An ion with a charge of 2- contains 10 electrons and 14 neutrons. What is its nucleon number?
Use of the Data Booklet is relevant to this question. What could be the proton number of an element that has three un…
Which statement about the first ionisation energies of magnesium and neon is correct?
In a sample of pure water, what is the maximum number of hydrogen bonds that one molecule of water can be involved in?
Hydrated cobalt(II) sulfate loses water when heated to give anhydrous cobalt(II) sulfate. All the water of crystallis…