What is the term for finely divided solid in a liquid

Which atom or ion is the largest? a. k b. k+ c. ca d. ca2+ e. li

Which are examples of how technology has advanced scientific understanding.1using hot water to sterilize medical equipment.2transplanting a human organ into another individual.3inserting genes from one sheep into another cell to make a cloneunderstanding the different structures that make up a cell.4examining microorganisms from the deepest parts of the ocean

Classify this reaction: 2al+n2-> aln.