#5 SET OF NUMBERS

Which number completes the following set?

15 - 91 - 82 - 46 - 61 - 84 - 59 - 78

Correct answer: 94

Explanation:

The numbers refer to all chemical elements of which the symbol starts with a 'P': 
P  15 Phosphor
Pa 91 Protactinium
Pb 82 Lead (Plumbum)
Pd 46 Palladium
Pm 61 Promethium
Po 84 Polonium
Pr 59 Praeseodym
Pt 78 Platinum

Pu 94 Plutonium

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