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Lesson Worksheet: Atomic Numbers and Mass Numbers Chemistry
In this worksheet, we will practice defining and calculating the atomic numbers and mass numbers of different atoms.
A fluorine atom has an atomic number of 9 and a mass number of 19.
How many protons are there in an atom of fluorine?
How many neutrons are there in an atom of fluorine?
How many electrons are there in an atom of fluorine?
An atom of sodium has a mass number of 23. What is the total number of protons and neutrons in the nucleus of the atom?
An atom of chlorine has a mass number of 35. What is the total number of protons and neutrons in its nucleus?
An atom of sulfur has 16 protons in its nucleus. What is the atomic number of sulfur?