If an atom has 9 protons and 10 neutrons, what is its atomic number?

1 Answer

Answer:

The number of neutrons is obtain through the difference of the mass number and the number of electrons.

Explanation:

By looking at the periodic table, you will see that Fluorine has 9 protons.

Since the number of electrons equal the number of protons, Fluorine has 9 electrons as well.

Meanwhile, it's mass number of 19, minus 10 neutrons, gives you 9 protons or electrons. Hence, the atom would be Fluorine.

As for the atomic number, it is obtainable through the periodic table itself.

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