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No, a 5p coin is not magnetic. The material used to make UK coins, including the 5p coin, is not attracted to magnets.
Depending upon which way you lay the coins: a 5p has a thickness of 1.7mm and a diameter of 18.0mm 1 mile = 1,609,344 mm (exactly) → if the coins are laid on heads/tails it will require 1,609,344 mm ÷ 18.0 mm/coin = 89,408 coins → if the coins are laid on edge it will require 1,609,344 mm ÷ 1.7 mm/coin = 946,672 16/17 coins ≈ 946,672.9 coins; 946,673 coins laid on their edge will be 0.1mm longer than 1 mile.
5p coins in the UK are made of copper-plated steel.
The last orbital filled in a xenon (Xe) atom is the 5p orbital. Xenon has a total of 54 electrons, with the configuration [Kr] 4d^10 5s^2 5p^6.
Coins made from pure nickel, or primarily nickel, will stick to magnets due to nickel being a magnetic metal. However, most commonly used coins, such as those made of copper, zinc, or aluminum, will not stick to magnets because these metals are not magnetic.