Its chemistry i need help

0.09 moles of sodium sulfate in 12 ml of solution

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

What is a possible quantum number set for an electron in the 3s orbital of a magnesium atom