What is variable valency​

Variable valency - definition Metals donate electrons from their valence shell so as to form positively charged ions such that the charge on the ion is equal to its electropositive valency. In transition elements, an atom loses electrons from the shell next to the valence shell (penultimate shell).

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boiling point is the temperature at which the vapor pressure of the liquid equals atmospheric pressure. the vapor pressure of solvent molecules is decreased when a solute is added, so a higher temperature is required to increase the number of solvent molecules in the gas phase above the liquid.

at the freezing point, the vapor pressures of the solid and liquid are equal; a lower temperature is needed to reduce the number of solvent particles above the liquid.

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tobey

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