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The term Key Stage 3 or KS3 is a legal term in the British educational system that describes school grades Year 7, Year 8, and Year 9 for students in the age range of 11 to 14.
A high level 4 or low level 5.
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25 orbitals 1 S 3 P 5 D 7 F 9 G 9+7+5+3+1= 25