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One of the four main areas in the periodic table, labelled by the letter associated with the last atomic orbital to be filled (See sodium spectrum). The s block is on the left of the table and the p block on the right, with the d block in between. The f block is often placed at the bottom of the table as it contains elements which are studied less frequently.See Appendix table 5.  



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Other Terms : radio frequency (r.f.) | NADP+ (nicotinamide adenine dinucleotide phosphate, coenzyme II) | alpha radiation



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