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Chemistry Syllabus Question

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Achiever:
Hello,

I've started studying for iGCSE Chemistry and I came by this one part of the syllabus that I didn't understand and was hoping someone could explain it to me.

'Describe the build-up of the electrons in 'shells' and understand the significance of the noble gas electronic structures and of valency electrons (the ideas of the distribution of electrons in s and p orbitals and in d block elements are not required.) '

I didnt fully understand what was asked of me.

Thank you in advance

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