Frank ICSE Solutions for Class 9 Physics - Electricity and Magnetism PAGE NO: 323 Solution 1: Positive and negative are the two kind of charges.Solution 2: Net charge on an atom is zero.Solution 3: 10 is the number of electrons present in Na+.Solution 4: An atom does not have any net charge while ion is either a positive charge or a negative … [Read more...] about Frank ICSE Solutions for Class 9 Physics – Electricity and Magnetism