Question

Lithium atomic no. is 3 and their also electrons and protons are 3 but neutrons is 4. why??​

Answer 1

Explanation:

That is 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.

Isotopes are elements with same atomic number but

Isotopes are elements with same atomic number but different atomic mass number