The chemical equation 2h2 + o2 6 2h2o represents a a. synthesis reaction c. single-replacement reaction b. decomposition reaction d. double-replacement 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

Answer///an early form of the atomic theory; dalton atomic theory;

The second and last option are the answers