<u>Answer</u>:
5 neutrons are in the isotope lithium-8
<u>Explanation</u>:
In the periodic table, lithium being the third element, its atomic number will be 3. i.e. it has 3 protons.
The atomic number = proton number
i.e. 3,
again we know that Mass number - proton number = neutron number.
In the given case it is, 8-3=5
In isotope 8 mass number will be 8, so as in isotope 7 it will be 7.
being a 3rd element in the periodic table its K shell contains 2 electron and L shell has 1 electron.
