교과서 질문Fluorine occurs naturally as a single isotope. How many protons, neutrons, and electrons are present in deuterium fluoride (2HF)? (Deuterium is 2H.)1068views
미해결 질문The atomic number of fluorine is 9 and its atomic mass is 19. How many neutrons does fluorine have?1541views
미해결 질문One isotope of sodium has 11 protons and 7 neutrons. What is the mass number of this isotope?1718views