2. Draw the atomic structure of a sodium atom and a sodium ion....explain why you draw it this way.


An atom do not have charge and its outer most electron shell is not a full shell.
An ion is form when an atom gain or lose electron and form a full shell. ions have charges and can be classify under positive or negative ion. when it gives away electrons, it is a positive ion but when it gain electron, it is a negative charge. therefore, sodium atom are drawn without charge and sodium ion are drawn with a positve charge as it give away 1 electron.

Source: picture from Lim Jie En of 3E5