This data shows how a beaker of water changes during 15 minutes of heating (line graph) help please..

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☆ionisation energy increases across a period from na -> ar☆ionisation energy decreases down a group from li -> fr☆ionic radius decreases across a period from na -> cl☆ionic radius increases down a groupfrom f -> ii hope it clarifies your doubts

They make up examples of physical properties 

Answer/when the cell uses energy;