The fixed of an atom is nearly all because of the protons and neutrons in the nucleus. The atom mass number is the variety of protons added to the number of neutrons and is given the price A. Because that this atom of lithium, A equals 6.
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The variety of protons in the cell nucleus of one atom is dubbed the atomic number. It has the prize Z. The atomic number of lithium is 3.
We can show the atomic mass number and the atomic number through the symbol for the element.
A is the number of neutrons plus proton in the nucleus.However, we already know the there are 7 protons. Therefore, there should be 8 neutrons in the nucleus to add up come 15.
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