Elements bond in fixed ratios and so can be represented by a chemical formula. For example, sodium chloride has the same number of sodium ions and chloride ions, so its formula is NaCl ...

Sodium polyacrylate molecules are very long and curly. The sodium parts, represented by the green circles and chemical symbol Na, have a positive charge and dissolve in water. The long portion of the ...

All oxygen atoms have 8 protons and all sodium atoms have 11 protons ... of each sub-atomic particle in an atom. The full chemical symbol for an element shows its nucleon number (A) at the ...