Domanda apertaThe atomic number of fluorine is 9 and its atomic mass is 19. How many neutrons does fluorine have?1744views
Domanda apertaOne isotope of sodium has 11 protons and 7 neutrons. What is the mass number of this isotope?1905views
Domanda apertaHow many protons, neutrons, and electrons are there in a neutral atom of 131I (iodine-131)?1665views
Domanda apertaTwo isotopes of the same element will have the same number of _____ but a different number of ____.1080views