Which term describes a substance that increases the concentration of hydroxide ions in solution?
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Element 87 francium have the highest atomic size, so in short the closest element to francium have the high atomic size.
To make a first step you have to know the balanced form for neutralization formula: 
According to this, you can <span>calculate what you are being asked :</span>
Then we have :
Hope everything is clear, here is the exact answer you need :
According to this, you can <span>calculate what you are being asked :</span>
Then we have :
Hope everything is clear, here is the exact answer you need :