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Lithium atomic no. is 3 then protons and elecrons are 3 but neutrons is 4. why?? |
| Answer» LITHIUM atom CONTAINS 3 protons in its NUCLEUS irrespective of the number of neutrons or ELECTRONS. ... Notice that because the lithium atom always has 3 protons, the atomic number for lithium is always 3. The mass number, however, is 6 in the isotope with 3 neutrons, and 7 in the isotope with 4 neutrons. | |