How is the cell of a one-celled organism different from the cells in a many-celled organism?

Cells that are in multicellular organisms are suited to do specific jobs and work together to help the organism stay alive. Single celled organisms have to perform all the actions themselves in order to stay alive. :) 

Multicellular cells does many jobs while the unicellular has one cell and that cell should do all the jobs. and in multi if one cell dies it will not affect the whole organism while the uni organisms if one cell dies the whole organism dies.

Aneutral atom must have the same number of neutrons and protons? no, they must have the same number of protons and electrons