carbon
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If you add 3 protons to lithium (which has 3 protons), you would create an element with 6 protons, which is carbon on the Periodic Table.
Adding one proton to a lithium atom would create a beryllium atom because the number of protons would increase from 3 to 4. This change would make the element more reactive and alter its chemical properties.
Helium is an element that has 2 protons in the nucleus.
Just add the protons and the neutrons. The answer is 14.
Addition of number of protons and neutrons.Mass of Electrons is neglected.
you add the number of protons (the atomic number) to the number of neutrons