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Edexcel Additional Chemistry


Structure of Atom:

An atom is a particle that cannot be divided further by chemical

The nucleus is made up of protons and neutrons and it has an overall
positive charge due to the protons having a +ve charge and the
neutrons none.


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In periods the elements are arranged in order of increasing atomic number and the period number is
the same number as the number of electron shell.

Elements in the same group have the same number of electrons in their outer shell.

In the periodic table you have the metals on…


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