Synthesis means"putting together". Dehydration means"Loss of water. Explain why chemists refer to the joining of monosaccharide molecules to form disaccharides as a dehydration synthesis reaction.

☆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