¿las reacciones químicas se clasifican en cambio físicos o químicos?¿por que?

We can't until we know what we are working with or on

Where is the illustration?

B.1 - hydrogren-1 can only mean there is 1 neutron. it's obvious there is 1 proton or else it wouldn't be hydrogen, so they wouldn't put a number after it unless they were indicating the number of neutrons