Question

what is the valence electrons of lithium beryllium boron nitrogen neon aluminum

Answer 1

Valance electrons refer to the electrons in the outer most ( valance) shell.
Li : atomic number 3: 2,1
valence electrons = 1
Be : atomic number 4: 2,2
V.e= 2
B : atomic number 5: 2,3
V. e= 3
N: atomic number 7: 2,5
v. e= 5
Ne : atomic number 10: 2,8
v.e=8
AL: atomic number 13:2,8,3
v.e=3