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Calcium has 20 electrons.
The first ring can only contain up to 2 electrons.After that rings can only contain up to 8 electrons.
Therefore the electronic config...

Crude oil is made up of a mixture of substances.Crude oil is vapourised before it enters the column.The column is hotter at the bottom and cooler at the top (around 350 degrees at the bottom, and 50 degre...

Exothermic = A reaction that transfers energy to its souroundings therefore the temperature of the sourounding increases (gets hotter). Can you think of an example? E.g. combustion, neutralisation. As hea...

Firstly we must use the periodic table to look at the number of protons (11) contained within a sodium atom. This tells us how many electrons are contained within the shells of that atom as these two are ...

Increasing acid concentration- increased number of reactant particles means they are more crowded so there is a greater chance of the particles collidingIncreasing temperature- reactant particles have mor...