How many neutrons are in one atom of fluorine with a mass number of 19?

The atom number is 9,(which means number of protons), mass number means number of protons+neutrons, 19-9=10, Fluorine has 10 neutrons

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explanation:

plants need sunlight, water, and carbon dioxide to make food. plants use the raw materials of water, nutrients they absorb from soil, and carbon dioxide to make sugars the plant can use. energy from the sun and chlorophyll are also needed.