미해결 질문How many protons, neutrons, and electrons are there in a neutral atom of 131I (iodine-131)?1542views
미해결 질문Two isotopes of the same element will have the same number of _____ but a different number of ____.1025views
미해결 질문How many protons, neutrons, and electrons are there in a neutral atom of 30P (phosphorus-30)?1034views
미해결 질문An isotope of yttrium has 39 protons and 59 neutrons. What is the mass number of that isotope?2121views