Chemistry, 20.09.2020 03:01, hidagiser

An atom has a mass number of 19 and an atomic number of 9. What element is it? What is it’s symbol? How many protons, neutrons and electrons does it have? PLEASE HELP NEED ANSWER ASAP

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An atom has a mass number of 19 and an atomic number of 9. What element is it? What is it’s symbol?...