By convention, the first letter of an element’s symbol is always capitalized, while the second letter (if present) is lowercase. ![]() The atomic symbol is a one- or two-letter abbreviation of the name of the element. Instead, chemistry defines a symbol for each element. But it can be unwieldy to use the name of elements all the time. When referring to an atom, we simply use the element’s name: the term sodium refers to the element as well as an atom of sodium. What are the atomic number and the mass number of this isotope? The number of protons in the nucleus of a tin atom is 50, while the number of neutrons in the nucleus is 68. Because the mass number is 235, then the number of neutrons in the nucleus is 235 − 92, or 143. ![]() If the atomic number of uranium is 92, then that is the number of protons in the nucleus.If it also has six neutrons in the nucleus, then the mass number is 6 + 6, or 12. If a carbon atom has six protons in its nucleus, its atomic number is 6.What are the number of protons and neutrons in the nucleus of this atom? An isotope of uranium has an atomic number of 92 and a mass number of 235. ![]() What are the atomic number and the mass number of these carbon atoms?
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