Domanda apertaWhich of these refers to atoms with the same atomic number but different atomic masses?1934views
Domanda apertaThe atomic number of fluorine is 9 and its atomic mass is 19. How many neutrons does fluorine have?1740views
Domanda apertaOne isotope of sodium has 11 protons and 7 neutrons. What is the mass number of this isotope?1898views
Domanda apertaHow many protons, neutrons, and electrons are there in a neutral atom of 131I (iodine-131)?1660views