Answer:
[tex]\boxed {\boxed {\sf D. \ 4}}[/tex]
Explanation:
The neutrons in an element can be found by subtracting the atomic number from the atomic mass.
[tex]\sf N=atomic \ mass- atomic \ number[/tex]
Li is the symbol for lithium.
This element has an atomic mass of 6.941, which we can round to 7.
Lithium's atomic number is 3.
[tex]\sf atomic \ mass =7 \\atomic \ number =3[/tex]
[tex]\sf N=7-3[/tex]
[tex]\sf N= 4[/tex]
Lithium has a total number of 4 neutrons.
