There are 20 diagonals in an octagon. This is calculated from the number of diagonals in a polygon formula = nx(n-3)/2 In an octagon, n = 8... View Article
Atomic number = Total no of proton Atomic mass = Total no of proton and neutron Hence for Neon, Atomic number = 10 Atomic mass = 10+10=20 K shell... View Article