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So for GCSE the key to this question is in the periodic table: Note drawing the atoms can be helpful to show the shells. 

F: 2,7

Cl: 2,8,7

Firstlet's look up Flurorine (symbol F in th...

Positive and negative ions attract one another and bind together forming a new substance. This is called ionic bonding. It is usually between a positive metal ion which i...

This question is about understanding how reactions happen, what it means for something to react and the factors controlling reactions. Here it is important to know that for a reaction to happen particles ...

Alkenes are a family of hydrocarbons (compounds made up of only hydrogen and carbon atoms) that all share the same chemical formula, similar chemical properties (due to same functional group) and trends i...

An increase in temperature will increse the rate of a chemical reaction, and a decrease in temperature will decrese the rate. This is because the hotter the reactant particles are, the more kinetic energy...