help me!.!.

HI FRIENDS,
                    PLEASE HELP ME.CAN YOU TELL ME THE ANSWER TO THE QUESTION WRITTEN BELOW IF YES THEN REPLY ME:

QUESTION:WHQAT IS THE DIFFERENCE BETWEEN SODIUM ATOM AND SODIUM ION?

IF YOU HAVE THE ANSWER MAIL IT TO ME ON MY ID ayusharghya@rediffmail.com
thanks and regards :
ayush