The symbol of an element is represented by (a) Calculate the number of neutrons in the atom of X. [1mark] (b) State the number of electrons in the atom of X.[1mark] (c) Write the electronic configuration of X.

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A sample question and solution is given below.

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Explanation:

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a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.

answer: gold foil experiment - he shot alpha particles at a gold foil

explanation: