All sodium atoms have 11 protons. The nuclei of some sodium atoms contain 12 neutrons and others contain 11. These different forms of sodium are called .

They carry out the exchange of gases as we breathe ( oxygen and carbon dioxide).

Ions gain or lose electrons

The answer is bhope this

What are the options? physical property can be color, smell, opacity, viscosity, density, infra red spectrum, melting and boiling points, attraction and repulson to magnets, etc.