D: 18
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An ion X⁺ has 23 nucleons and 10 electrons. What does the nucleus of X contain?
The diagram shows the structures of the atoms of elements L and M. The elements combine to form a compound. What is t…
Element Q is in Period 3 of the Periodic Table. It can form ions with the formula Q³⁻. Which element is most likely t…
Which metal can react rapidly with steam but reacts only very slowly with cold water?
A hydride is a compound containing only two elements, one of which is hydrogen. Which element can form the greatest n…
What is not essential for photosynthesis?