Asubstance dissolves in water by breaking up into smaller pieces. these pieces of the same substance spread throughout the water. this process is known as

  A substance dissolves in water by breaking up into smaller pieces. these pieces of the same substance spread throughout the water. this process is known as diffusion.

In short, your answer would be : Diffusion.

Hope this helps !

Photon 

☆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

Answerd. may include all of these are many definitions of bases: the  brønsted-lowry definition of acids and bases says that bases are proton acceptors.the arrhenius definition of acids and bases says that bases increase [oh⁻] in solution (thereby producing oh⁻ ions)the lewis definition of acids and bases says that bases donate electron pairs.therefore, the sensible answer is that a base may include all of the described characteristics.