the mass number of an element is 18. its atom contains 7 electrons. what is the number of protons and neutrons in the atom?
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the mass number of an element is 18. its atom contains 7 electrons. what is the number of protons and neutrons in the atom?
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there is mistake in question
fluorine has mass no. of 18.9998 which will be estimated to 19.
and it has 9 electrons and 9 protons and 10 neutrons.
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