Calculate the valency of calcium,magnesium ,sodium,silicon,neon,potasium,argon,sulphur, aluminium
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calcium-2
magnesium-2
sodium-1
silicon-4
neon-0
potassium-1
argon-0
sulphur-2
aluminium-3
magnesium-2
sodium-1
silicon-4
neon-0
potassium-1
argon-0
sulphur-2
aluminium-3
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